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18 tháng 1 2019

invention => inventions

expensive => inexpensive

supposed => supposedly

science establishment => scientific establishment

Để t tìm tiếp xem, mới được nhiêu đó thôi :v

18 tháng 1 2019

Em tìm được thêm 1 word.

environmentalist =>environmentalists

recycling/ nothing/ list/ vegetables/ something/ save/ trouble/ polluting/ taking. Our environment is in (1) ______. Modern ways of living and today’s industries are (2) ______ it. Most people think there is (3) ______ they can do. This is not true. Everyone can do something to help (4) ______ our environment. Here is a (5) ______ of things you can do. Help to cut pollution by (6) ______ the bus to work instead of your car. Buy fruit and (7) ______ that have not been treated...
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recycling/ nothing/ list/ vegetables/ something/ save/ trouble/ polluting/ taking. Our environment is in (1) ______. Modern ways of living and today’s industries are (2) ______ it. Most people think there is (3) ______ they can do. This is not true. Everyone can do something to help (4) ______ our environment. Here is a (5) ______ of things you can do.
    • Help to cut pollution by (6) ______ the bus to work instead of your car.
    • Buy fruit and (7) ______ that have not been treated with pesticides.
    • Recycle all your cans, bottles and paper. There should be a (8) ______ center somewhere near your home, so take them there.
Most of the world’s energy comes from the sun. The sun’s energy is in wood, oil, and other things that people use for energy. VI. Read the text then answer true or false People use many sources of energy. Ancient people used only their arms, hands, and simple tools until they discovered fire. Later, people learned to use the energy of the wind to sail ships. Then they learned to use animals to do work. In the eighteenth and nineteenth centuries, people began to use machines. The first machines used steam. They burned coal to heat water. The hot water turned into steam, and the steam engine did the work. Later, people began to use the gasoline engine, and today people are using nuclear energy. Energy is one of the basic concepts, or ideas, of physics. It is the ability to do work. Without energy we could live. We need energy to work, and scientists are always looking for new sources of energy. 1. None of the world’s energy comes from the sun. 2. Wind, steam, and gasoline are sources of energy. 3. People have never used nuclear energy. 4. Energy is the ability to do work. 5. We need new sources of energy.
2
9 tháng 4 2018

recycling/ nothing/ list/ vegetables/ something/ save/ trouble/ polluting/ taking. Our environment is in (1)trouble. Modern ways of living and today’s industries are (2)polluting it. Most people think there is (3) nothing they can do. This is not true. Everyone can do something to help (4) save our environment. Here is a (5)list of things you can do.

    • Help to cut pollution by (6)taking the bus to work instead of your car.
    • Buy fruit and (7) vegetables that have not been treated with pesticides.
    • Recycle all your cans, bottles and paper. There should be a (8) recycling center somewhere near your home, so take them there.
9 tháng 4 2018

Our environment is in trouble. Modern ways of living and today’s industries are polluting it. Most people think there is nothing they can do. This is not true. Everyone can do something to help save our environment. Here is a list of things you can do.
- Help to cut pollution by taking the bus to work instead of your car.
- Buy fruit and vegetables that have not been treated with pesticides.
- Recycle all your cans, bottles and paper. There should be a recycling center somewhere near your home, so take them there.

Most of the world’s energy comes from the sun. The sun’s energy is in wood, oil, and other things that people use for energy.

VI. Read the text then answer true or false

People use many sources of energy. Ancient people used only their arms, hands, and simple tools until they discovered fire. Later, people learned to use the energy of the wind to sail ships. Then they learned to use animals to do work. In the eighteenth and nineteenth centuries, people began to use machines. The first machines used steam. They burned coal to heat water. The hot water turned into steam, and the steam engine did the work. Later, people began to use the gasoline engine, and today people are using nuclear energy. Energy is one of the basic concepts, or ideas, of physics. It is the ability to do work. Without energy we could live. We need energy to work, and scientists are always looking for new sources of energy.

1. None of the world’s energy comes from the sun. F

2. Wind, steam, and gasoline are sources of energy. T

3. People have never used nuclear energy. F

4. Energy is the ability to do work. T

5. We need new sources of energy. T

8 tháng 4 2017

Read the following passage, and then tick the correct answers : T or F.

Many people still believe that natural resources will never be used up. Actually, the world's energy resources are limited. Nobody knows exactly how much fuel is left. However, we also should use them economically and try to find out alternative sources of power. According to Professor Marvin Burnham of the New England Institute of Technology, we have to start saving coal, oil and gas before it is too late; and solar power is the only alternative.

1. Natural resources will never run out. F

2. We don't know exactly how much fuel is left. T

3. We shouldn't waste natural resources. T

4. We should find out other types of energy besides fossil fuels. T

5. According to Professor Marvin Burnham, solar energy will be used as a form of alternative energy. F

II/ Read the text and choose the best answers A, B, C or D. to the questions. (1m) Most of the countries in the world have searched for alternative sources of energy in various directions. Many communities are burning garbage and other biological waste products to produce electricity. Converting waste products to gases or oil is also an efficient way to dispose of waste. Experimental work is being done to derive synthetic fuels from coal, oil, shale and coal tars. But today that process has...
Đọc tiếp

II/ Read the text and choose the best answers A, B, C or D. to the questions. (1m)

Most of the countries in the world have searched for alternative sources of energy in various directions. Many communities are burning garbage and other biological waste products to produce electricity. Converting waste products to gases or oil is also an efficient way to dispose of waste.

Experimental work is being done to derive synthetic fuels from coal, oil, shale and coal tars. But today that process has proven expensive. Other experiments are underway to harness power with giant windmills. Geothermal power heat from the earth is also being tested.

Some experts expect utility companies to revive hydroelectric power derived from streams and rivers. Fifty years ago hydroelectric power provided one third of the electricity used in the United States, but today it supplies only five percent. The oceans are another potential source of energy. Scientists are studying ways to convert the energy of ocean currents, tides, and waves to electricity. Experiments are also underway to make use of the temperature differences in ocean water to produce energy.

1. Which is the best title of the passage?

A. The use of water productions for energy

B. Efficient ways of disposing of waste

C. The search for Alternative Sources of Energy

D. New Discoveries in Geothermal Power

2. Fifty years ago one third of the electricity in the United States was provided by_________.

A. wind B. waste products C. oil D. water

3. In the second paragraph, the phrase “synthetic fuels” could be best replaced by which of the following _________.

A. biological fuels B. artificial made fuels

C. low burning fuels D. fast burning fuels

4. Which of the following is NOT mentioned in the passage as an alternative source of energy?

A. electricity B. burning of garbage

C. geothermal power D. synthetics fuels

5. According to the author, the impracticability of using coal, oil shale and coal tars as sources of energy is due to _________.

A. their being money consuming B. their being time consuming

C. the scarcity of sources D. the lack of technology

2
4 tháng 1 2020

1. C

2.

3. B

4. A

5. A

4 tháng 1 2020

cau 2 la dap an nao

Use the cues given to write correct sentences 1. For a long time / people / use / water / power machines 2. Solar panels / place / the roof / a house / and / sun's energy / use / heat water 3. We / use energy / the sun, the wind, and the water 4. Many countries / already using / solar energy 5. The earth's fossil fuels / running out 6. We / looking / cheap, clean, effective source / energy / not cause pollution or waste natural resource 7. Recently / wind / use / generate...
Đọc tiếp

Use the cues given to write correct sentences

1. For a long time / people / use / water / power machines

2. Solar panels / place / the roof / a house / and / sun's energy / use / heat water

3. We / use energy / the sun, the wind, and the water

4. Many countries / already using / solar energy

5. The earth's fossil fuels / running out

6. We / looking / cheap, clean, effective source / energy / not cause pollution or waste natural resource

7. Recently / wind / use / generate electricity

8. The sun / supply / all energy / used / grow plants / evaporate water / rain / and / maintain / temperature / planet

9. At present / most / our electricity / come / use / coal, gas, oil or nuclear power

10. Today / water power / mostly / use / generate electricity

11. This power / could / provide / sun

12. If we / able / collect solar energy / we / be sure / have enough power

13. Scientists / try / find / other alternative sources / energy

14. One percent / soalr energy / reach / earth / anough / provide power / the total population

15. Viet Nam / an advanced teachnology / solar energy

16. The energy / store / a number of days

17. Car / use solar energy / gas / by the year 2030

18. Energy / wind / use centuries / move ships, grind grain, pump water / and / do other forms / work

19. On / cloudy / you / use / solar energy / too

20. Almost all our energy / come / oil / gas / natural gas / . / We / them / fossil fuels

1
24 tháng 10 2017

Use the cues given to write correct sentences

1. For a long time / people / use / water / power machines

For a long time people have used water to power machines

2. Solar panels / place / the roof / a house / and / sun's energy / use / heat water

Solar panels are placed on the roof of a house and the sun's energy is used to heat water

3. We / use energy / the sun, the wind, and the water

We use energy from the sun, the wind, and the water

4. Many countries / already using / solar energy

Many countries have already been using solar energy

5. The earth's fossil fuels / running out

The earth's fossil fuels are running out

6. We / looking / cheap, clean, effective source / energy / not cause pollution or waste natural resource

We are looking for a cheap, clean, effective source of energy that does not cause pollution or waste natural resource

7. Recently / wind / use / generate electricity

Recently wind has used to generate electricity

8. The sun / supply / all energy / used / grow plants / evaporate water / rain / and / maintain / temperature / planet

The sun supplies all energy used to grow plants and to evaporate water for rain and to maintain tenperature of the planet

9. At present / most / our electricity / come / use / coal, gas, oil or nuclear power

At present, most of our electricity comes from the use of coal, gas, oil or nuclear power

10. Today / water power / mostly / use / generate electricity

Today, water power is mostly used to generate electricity

11. This power / could / provide / sun

This power could be provided by the sun

12. If we / able / collect solar energy / we / be sure / have enough power

If we are able to collect solar energy, we will be sure to have enough power

13. Scientists / try / find / other alternative sources / energy

Scientists are trying to find the other alternative sources of energy

14. One percent / soalr energy / reach / earth / anough / provide power / the total population

One percent of the solar energy reaches to the earth is enough to provide the power for the total population

15. Viet Nam / an advanced teachnology / solar energy

Viet Nam can be an advanced technology in solar energy

16. The energy / store / a number of days

The energy can be stored a number of days

17. Car / use solar energy / gas / by the year 2030

Car will use solar energy instead of gas by the year 2030

18. Energy / wind / use centuries / move ships, grind grain, pump water / and / do other forms / work

Energy from the wind has been used for centuries to move ships, grind grain, pump water and tto do other forms of work

19. On / cloudy / you / use / solar energy / too

On cloudy days, you can use solar energy, too

20. Almost all our energy / come / oil / gas / natural gas / . / We / them / fossil fuels

Almost all our energy comes from oil, gas and natural gas. We call them fossil fuels

B. Rewite the following sentences : 1. Why don't we go to the canteen for a drink ? --->................. 2. I want him to take showers to save water. --->................ 3. She went to bed early because of her sickness. --->............... II/ Are you looking for a cheap, clean, effective source of power that doesn't cause pollution or waste natural resources? Look no further than solar energy from our sun. At present, most of our electricity comes from the use of coal, and gas, oil or...
Đọc tiếp

B. Rewite the following sentences :
1. Why don't we go to the canteen for a drink ?
--->.................
2. I want him to take showers to save water.
--->................
3. She went to bed early because of her sickness.
--->...............
II/
Are you looking for a cheap, clean, effective source of power that doesn't cause pollution or waste natural resources? Look no further than solar energy from our sun. At present, most of our electricity comes from the use of coal, and gas, oil or nuclear power. This power could be provided by the sun. One percent of the solar energy that reaches the earth is enough to provide power for the total population. Many countries are already using solar energy. Solar panels are placed on the roof of a house and the sun s energy is used to heat water. The energy can be stored for a number of days, so on cloudy days you can use solar energy, too.
1/ Questions :
a. What is solar power like ?
--->
b. Where are the solar panels placed ?
--->
VI / Give the correct form of the verbs :
1/ If we ( replace ).......... ordinary light bulbs with energy-saving bulbs, we can save a lot of money.
2/ I suggest that we ( use ).......... paper bags instead of plastic bags.
3/ Tuan ( porget ) .......... to turn off the television when he left for school.
4/ He suggested ( collect )........... garbage to protect the environment.
VII/ Write the sentences using the words provided :
1. it /necessary / you to reduce the amount / garbage you produce.
---> ..............................
2. Collect / plastic bags, empty cans and bottles then send them / factories / recyling.
---> ..............................
VIII. Choose the best option to complete each of the following sentences :
1/......... air is one of the many problems we have to solve.
A. Pure B. Polluted
C. Dust C. Pleasant
2/"................." means a piece of land full of rubbish.
A. junkyard B. treasure
C. hedge C. stream
3/ If you want to save money, you should ......... the amount of water your family uses.
A. increase B. reduce
C. adapt D. repair
4. I'm disappointed ............ people have spoiled this area.
A. that B. when
C. if D. how
5. Minh's English is excellent. He speaks .........
A. perfectly English
B. English perfectly
C. perfect English
D. English perfect
6. We couldn't go on a picnic as planned............. it was raining.
A. however B. but
C. because D. so
7. If you are busy, we........... this by ourselves.
A. will do B. did
C. would do D. doing
8. I suggest ........... showers instead of talking bath.
A. take B. talking
C. to take D. to talking
9. Scientists are looking for an ............ way to reduce energy consumption.
A. effect B. effects
C. effective D. effectively
13. He was born............. March 25, 1992.
A. at B. on
C. in D. for
-- Giúp mình trước 16h hôm nay nhé --
Thank you !

1
25 tháng 2 2019

B. Rewite the following sentences :
1. Why don't we go to the canteen for a drink ?
---> How about going to the canteen for a drink ?
3. She went to bed early because of her sickness.
---> Because she was sick , she went to bed early
II/
Are you looking for a cheap, clean, effective source of power that doesn't cause pollution or waste natural resources? Look no further than solar energy from our sun. At present, most of our electricity comes from the use of coal, and gas, oil or nuclear power. This power could be provided by the sun. One percent of the solar energy that reaches the earth is enough to provide power for the total population. Many countries are already using solar energy. Solar panels are placed on the roof of a house and the sun s energy is used to heat water. The energy can be stored for a number of days, so on cloudy days you can use solar energy, too.
1/ Questions :
a. What is solar power like ?
---> It's cheap, clean, effective
b. Where are the solar panels placed ?
---> Solar panels are placed on the roof of a house
VI / Give the correct form of the verbs :
1/ If we ( replace )......replace.... ordinary light bulbs with energy-saving bulbs, we can save a lot of money.
2/ I suggest that we ( use )...using....... paper bags instead of plastic bags.
3/ Tuan ( porget ) ....forgot...... to turn off the television when he left for school.
4/ He suggested ( collect )....collecting ....... garbage to protect the environment.
VII/ Write the sentences using the words provided :
1. it /necessary / you to reduce the amount / garbage you produce.
---> It's necessary for you to reduce the amount of garbage you produce.
VIII. Choose the best option to complete each of the following sentences :
1/......... air is one of the many problems we have to solve.
A. Pure B. Polluted
C. Dust C. Pleasant
2/"................." means a piece of land full of rubbish.
A. junkyard B. treasure
C. hedge C. stream
3/ If you want to save money, you should ......... the amount of water your family uses.
A. increase B. reduce
C. adapt D. repair
4. I'm disappointed ............ people have spoiled this area.
A. that B. when
C. if D. how
5. Minh's English is excellent. He speaks .........
A. perfectly English
B. English perfectly
C. perfect English
D. English perfect
6. We couldn't go on a picnic as planned............. it was raining.
A. however B. but
C. because D. so
7. If you are busy, we........... this by ourselves.
A. will do B. did
C. would do D. doing
8. I suggest ........... showers instead of talking bath.
A. take B. talking
C. to take D. to talking
9. Scientists are looking for an ............ way to reduce energy consumption.
A. effect B. effects
C. effective D. effectively
13. He was born............. March 25, 1992.
A. at B. on
C. in D. for

#Yumi

Check True or False Energy is very important in modern life. People use energy to run machines, heat and cool their homes, cook, give light, transport people and products from place to place. Most energy nowadays comes from fossil fuels such as petroleum, coal and natural gas. However, burning fossil fuels causes pollution. Also, if we don’t find new kinds of energy, we will use up all the fossil fuels in the twenty –first century. Scientists are working to find other kinds of energy for the...
Đọc tiếp

Check True or False

Energy is very important in modern life. People use energy to run machines, heat and cool their homes, cook, give light, transport people and products from place to place. Most energy nowadays comes from fossil fuels such as petroleum, coal and natural gas. However, burning fossil fuels causes pollution. Also, if we don’t find new kinds of energy, we will use up all the fossil fuels in the twenty –first century. Scientists are working to find other kinds of energy for the future. What might these sources of energy be?

____ 29/ Energy is used to produce a lot of electrical things.

____ 30/ Energy comes from natural resources.

____ 31/ burning fossil fuels causes pollution.

____ 32/ Everyone tries their best to find other kinds of energy for the future.

(33-36) Rewrite the sentences so that they are nearest in meaning to the sentence printed before them.

33/Chi didn’t drink anything. She was very thirsty.

-->Although ____________________________________________________

34/ Don’t forget to buy me a newspaper.

->Remember ___________________________________________________

35/ I suggest that we should have a mechanic check our motorbike once a month.

--> I suggest _____________________________________________________

36/The film Titanic is on at Rex Cinema. Have you seen it?

--> Have you _____________________________________________________

1
9 tháng 1 2018

Check True or False

Energy is very important in modern life. People use energy to run machines, heat and cool their homes, cook, give light, transport people and products from place to place. Most energy nowadays comes from fossil fuels such as petroleum, coal and natural gas. However, burning fossil fuels causes pollution. Also, if we don’t find new kinds of energy, we will use up all the fossil fuels in the twenty –first century. Scientists are working to find other kinds of energy for the future. What might these sources of energy be?

__T__ 29/ Energy is used to produce a lot of electrical things.

__F__ 30/ Energy comes from natural resources.

_T___ 31/ burning fossil fuels causes pollution.

__T__ 32/ Everyone tries their best to find other kinds of energy for the future.

(33-36) Rewrite the sentences so that they are nearest in meaning to the sentence printed before them.

33/Chi didn’t drink anything. She was very thirsty.

-->Although ___Chi was very thirsty ,she didn’t drink anything__

34/ Don’t forget to buy me a newspaper.

->Remember ________ to buy me a newspaper._______

35/ I suggest that we should have a mechanic check our motorbike once a month.

--> I suggest _having a mechanic check our motorbike once a month

36/The film Titanic is on at Rex Cinema. Have you seen it?

--> Have you ________seen the film Titanic on at Rex Cinema____

1. Robots can ............. our houses when we are away. 2. In the future, robots will be able to do more ............. things for us. 3. I don't agree .............. you that robots will be able to write a letter to an English friend. 4. They will be very useful because they will be able to do ............. everything for us. 5. Do you think robots can work longer than people ............. getting tired. 6. My father always ............. coffee at home instead of going to the coffee...
Đọc tiếp

1. Robots can ............. our houses when we are away.

2. In the future, robots will be able to do more ............. things for us.

3. I don't agree .............. you that robots will be able to write a letter to an English friend.

4. They will be very useful because they will be able to do ............. everything for us.

5. Do you think robots can work longer than people ............. getting tired.

6. My father always ............. coffee at home instead of going to the coffee shop.

7. Robots will be able to .............. to personal computer in the future.

8. Nowadays robot can't talk to people or play sports, but in the future I think they ...............

9. Will robots be able ............. our voices?

10. Robots can't talk to people or recognise our voices, but scientists are working ................ the solution.

11. Many people think spending money on robots is a complete ................. of time and money.

12. ....................... you walk when you were two?

13. These robots can do many things for the ............ such as cleaning streets or looking after the garden.

14. Home robots can do things .................... repairing things around the house of looking after the garden.

15. ............. do you think about the new kinds of robots?

16. Our future robot will be able to help us ................ the gardening.

17. Robots are helping us a lot in industry, education, and in our house - ...................

18. We waste a lot of money and time researching and making robots. .......................

19. We must be careful because some people may use robots...............

20. Robots will be very useful for our lives but they use ................. energy.

0
the pressure is on. In an international______(complete) to find the best teenage band; 1100 wannable stars are norvously waiting for results. Soon they will know if they are in the final group of six. It has not been easy. A special team of D Js. These experts know the music industry ____ ( good) and they know what succeeds fron indie to pop and traditional to alternative music. So how can the band____ ( succeed) convince these judges? Some have used lyrics to describe what interests teenagers...
Đọc tiếp

the pressure is on. In an international______(complete) to find the best teenage band; 1100 wannable stars are norvously waiting for results. Soon they will know if they are in the final group of six. It has not been easy. A special team of D Js. These experts know the music industry ____ ( good) and they know what succeeds fron indie to pop and traditional to alternative music. So how can the band____ ( succeed) convince these judges? Some have used lyrics to describe what interests teenagers today. Elena from georgia hopes her works help teenagers make ____ ( decide) for themselves. Richard from France sings about teenage loves of clothes and image but says he is obviously referring to himself. Finally there is george who raps ____ ( impress) in greek and english about friendship and loyalty. Other bands just offer great musical entertainment and impress the judges with their ____ (enthuse) and energy. The Go Band from rio give a cool hip hop _____ (perform) while the six columbians in the band hop'n'skip ______ (energy) show a love of rock 'n' roll.

t

1
13 tháng 11 2017

the pressure is on. In an international___completion___(complete) to find the best teenage band; 1100 wannable stars are norvously waiting for results. Soon they will know if they are in the final group of six. It has not been easy. A special team of D Js. These experts know the music industry __well__ ( good) and they know what succeeds fron indie to pop and traditional to alternative music. So how can the band__successes__ ( succeed) convince these judges? Some have used lyrics to describe what interests teenagers today. Elena from georgia hopes her works help teenagers make __decision__ ( decide) for themselves. Richard from France sings about teenage loves of clothes and image but says he is obviously referring to himself. Finally there is george who raps __impressively__ ( impress) in greek and english about friendship and loyalty. Other bands just offer great musical entertainment and impress the judges with their __enthusiasm__ (enthuse) and energy. The Go Band from rio give a cool hip hop ___performance__ (perform) while the six columbians in the band hop'n'skip ___energetic___ (energy) show a love of rock 'n' roll.

Question II. Read the passage and answer the questions below The search for alternative resources of energy has resulted in various directions. Many communities are burning garbage and other biological waste products to produce electricity. Changing waste products into gases or oil is also an efficient way to dispose of waste. Experimental work is being done to make synthetic fuels from coal, or coal tars. But to date, that process has proved expensive. Other...
Đọc tiếp

Question II. Read the passage and answer the questions below

The search for alternative resources of energy has resulted in various directions. Many communities are burning garbage and other biological waste products to produce electricity. Changing waste products into gases or oil is also an efficient way to dispose of waste. Experimental work is being done to make synthetic fuels from coal, or coal tars. But to date, that process has proved expensive. Other experiments are underway to harness power with giant windmills. Geothermal power, heat from the earth, is also being tested.

Some experts are trying to revive hydroelectric power which is derived from streams and rivers. Fifty years ago, hydroelectric power provided one third of the electricity used in the United States, but today it supplies only four per cent. The oceans are another source of energy. Scientists are studying ways to change the energy of ocean currents, tides, and waves into electricity. Experiments are also underway to make use of temperature differences in ocean water to produce energy.

1. What are many communities doing to produce electricity?

...............................

2. Has the process of making synthetic fuels from coal, or coal tars proved cheap?

................................

3. Where is hydroelectric power derived from?

..........................

4. What percentage of the electricity used in the United States does hydroelectric power provide today? ......................

..............................

Question III. Fill in each space with a suitable word

A. British and American English have a lot of words which look the same but have different meanings. Nobody ever gets ....(.1)...trouble if they make a mistake, although you may get a strange look if you ask for the wrong clothes. There are some American English words that the British don’t use at .... (2).... . However, most of the .... (3).... between British and American English are small. You can usually understand what words .....(4)..... from the context.

1,...;2,...;3,......;4,.....

B. Rivers are one of the world's most important natural 1. _____. Many cities are on large rivers, and almost every country 2. _____ at least one river that plays an important part 3. ____ the lives of its people. Besides transportation, rivers supply food, water for crops, water to drink, 4. _____ opportunities for recreation.

1. .../2. ../3. ....../4. .......

1
28 tháng 3 2018

Question II. Read the passage and answer the questions below

The search for alternative resources of energy has resulted in various directions. Many communities are burning garbage and other biological waste products to produce electricity. Changing waste products into gases or oil is also an efficient way to dispose of waste. Experimental work is being done to make synthetic fuels from coal, or coal tars. But to date, that process has proved expensive. Other experiments are underway to harness power with giant windmills. Geothermal power, heat from the earth, is also being tested.

Some experts are trying to revive hydroelectric power which is derived from streams and rivers. Fifty years ago, hydroelectric power provided one third of the electricity used in the United States, but today it supplies only four per cent. The oceans are another source of energy. Scientists are studying ways to change the energy of ocean currents, tides, and waves into electricity. Experiments are also underway to make use of temperature differences in ocean water to produce energy.

1. What are many communities doing to produce electricity?

........Many communities are burning garbage and other biological waste products to produce electricity.........

2. Has the process of making synthetic fuels from coal, or coal tars proved cheap?

...............Yes, it has .................

3. Where is hydroelectric power derived from?

.............Some experts are trying to revive hydroelectric power which is derived from streams and rivers. .............

4. What percentage of the electricity used in the United States does hydroelectric power provide today?

..........Today it supplies only four per cent. .............

Question III. Fill in each space with a suitable word

A. British and American English have a lot of words which look the same but have different meanings. Nobody ever gets ..into ....trouble if they make a mistake, although you may get a strange look if you ask for the wrong clothes. There are some American English words that the British don’t use at ....least.... . However, most of the ....different .... between British and American English are small. You can usually understand what words .....different .... from the context.

B. Rivers are one of the world's most important natural 1. __resources ___. Many cities are on large rivers, and almost every country 2. __has ___ at least one river that plays an important part 3. ___in_ the lives of its people. Besides transportation, rivers supply food, water for crops, water to drink, 4. __Besides ___ opportunities for recreation.