We use many different energy sources to do work for us. Energy sources are classified into two groups - renewable and nonrenewable. Non-renewable energy sources are those that take millions of years to form and will run out some day. It is energy that comes from fossil fuels such as coal, crude oil, and natural gas. Fossil fuels are mainly made up of carbon and were formed millions of years ago. The chemical reaction which takes place when we burn fossil fuels releases carbon compounds such as carbon monoxide and carbon dioxide into the air. Carbon dioxide is one of the green house gases which is contributing to global warming and air pollution. On the other hand, renewable energy sources will never run out, are better for the environment and do not cause pollution. Renewable energy is often called green energy because it is a natural energy, always available and does not have to be formed like nonrenewable energy. The green energy is always there. For example, the Sun consistently shines, water is abundant, and the winds blow throughout the year. The five types include solar, energy from the Sun; geothermal, energy from heat within the Earth; hydroelectric, energy from moving water; biomass, energy from dead plants and microorganisms and finally, energy from the wind.

I. Change into passive voice
1. We are teaching street children these summer.

2. I will make candles on my next experiment.
3. Peter found out the answer for this question.
4. They were reading comics while we were watering flowers in the front garden.
5. Tim has just decorated his new house.
6. They can’t hold the meeting because of the deadline.
7. She has made many mistakes in the last exam.
8. Nguyen Du wrote “Truyen Kieu”
9. The little girl is feeding fish.
10.She is going to give a son.
11.John invited me to his birthday party last night.
12. The mother was preparing the dinner in the kitchen while her children were tidying
the house.
13.We should clean our teeth twice a day.
14.Our teacher has explained us about passive voice.
15.Tom will visit his parents next month.
16.He didn’t phone the secretary this morning.
17.I won’t hang these old pictures in the living room.
18.Some people will interview the new president on TV.
19.How many languages do you speak?
20.He has broken his nose in a football match.

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Complete each of the following sentences with one of the phrasal verbs given in the box. Each phrasal verb is used only ONE. Make any necessary changes:

You’ve always brought up your children to come to you when they’re in trouble

You’ve always (23)__________ your children to come to you when they're in trouble. You feel it’s your job to

(24)_________ them when they’re having problems. But now, as your children are (25)__________, they often don’t want to share their problems with you. That's perfectly normal, so don’t worry! Of course, you want to

(26)_________well with your children, but that means you have to give them some freedom. Maybe they’ve (27)__________with their best friend and feel upset and angry. Maybe they’ve just (28)__________ with the boyfriend or girlfriend they’ve been (29)________ with. Maybe they've been (30)________ by a friend who they trusted. Teenagers go through all these problems. If they want to talk to you about it, then that’s fine. But if they don’t, don’t force them. They’ll come to you when they’re ready.

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