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Exercise 4: Choose the correct answer 1. He is your friend, (aren’t - isn’t - amn’t) ________ he?2. She was in London, (won’t - weren’t - wasn’t) ________ she?3. His father drives a car, (don’t - won’t - doesn’t) ________ he?4. You can play the guitar, (couldn’t - can’t - can) ________ you?5. Liz won’t come, (is - doesn’t - will) ________ she?6. Sam went to the zoo, (don’t - didn’t - doesn’t) ________ he?7. Pat has a sister, (haven’t - hasn’t - hadn’t) ________ she?8. Mike can’t drive a car,...
Đọc tiếp

Exercise 4: Choose the correct answer

1. He is your friend, (aren’t - isn’t - amn’t) ________ he?

2. She was in London, (won’t - weren’t - wasn’t) ________ she?

3. His father drives a car, (don’t - won’t - doesn’t) ________ he?

4. You can play the guitar, (couldn’t - can’t - can) ________ you?

5. Liz won’t come, (is - doesn’t - will) ________ she?

6. Sam went to the zoo, (don’t - didn’t - doesn’t) ________ he?

7. Pat has a sister, (haven’t - hasn’t - hadn’t) ________ she?

8. Mike can’t drive a car, (could - can - can’t) ________ he?

9. They didn’t go there, (do - does - did) ________they?

10. Bob doesn’t like football, (do - does - did) ________ he?

11. Mag could draw well, (can’t - couldn’t - can) ________ she?

12. He mustn’t come, (can’t - must - mustn’t) ________ he?

13. The cakes are tasty, (isn’t - wasn’t - aren’t) ________ they?

14. He didn’t fall down, (didn’t - don’t - doesn’t) ________ he?

15. We run around, (doesn’t - don’t - didn’t) ________ we?

16. They will train here, (don’t - didn’t - won’t) ________ they?

17. She likes ice-cream, (don’t - didn’t - doesn’t) ________ she?

18. It is Monday, (aren’t - isn’t - wasn’t) ________ it?

19. He wasn’t at the lesson, (is - were - was) ________ he?

20. We like coffee, (don’t - doesn’t - won’t) ________ we?

 

3
15 tháng 7 2021

Exercise 4: Choose the correct answer

1. He is your friend, (aren’t - isn’t - amn’t) ________ he?

2. She was in London, (won’t - weren’t - wasn’t) ________ she?

3. His father drives a car, (don’t - won’t - doesn’t) ________ he?

4. You can play the guitar, (couldn’t - can’t - can) ________ you?

5. Liz won’t come, (is - doesn’t - will) ________ she?

6. Sam went to the zoo, (don’t - didn’t - doesn’t) ________ he?

7. Pat has a sister, (haven’t - hasn’t - hadn’t) ___doesn't_____ she?

8. Mike can’t drive a car, (could - can - can’t) ________ he?

9. They didn’t go there, (do - does - did) ________they?

10. Bob doesn’t like football, (do - does - did) ________ he?

11. Mag could draw well, (can’t - couldn’t - can) ________ she?

12. He mustn’t come, (can’t - must - mustn’t) ________ he?

13. The cakes are tasty, (isn’t - wasn’t - aren’t) ________ they?

14. He didn’t fall down, (didn’t - don’t - doesn’t) ___did_____ he?

15. We run around, (doesn’t - don’t - didn’t) ________ we?

16. They will train here, (don’t - didn’t - won’t) ________ they?

17. She likes ice-cream, (don’t - didn’t - doesn’t) ________ she?

18. It is Monday, (aren’t - isn’t - wasn’t) ________ it?

19. He wasn’t at the lesson, (is - were - was) ________ he?

 

20. We like coffee, (don’t - doesn’t - won’t) ________ we?

 

15 tháng 7 2021

1 isn't

2 wasn't

3 doesn't

4 can't

5 will

6 didn't

7 doesn't

8 can

9 did

10 does

11 couldn't

12 must

13 aren't

14 did

15 don't

16 won't

17 doesn't

18 isn't

19 was

20 don't

1. Mr. Jim said that he............happy with his new assistant.A. weren’t                   B. wasn’t                     C. isn’t                        D. aren’t2. Tom said that his parents.............them over for dinner the week before.A. had visited             B. has visited              C. invite                      D. will visit3. The little girl said that............didn’t want to wear her raincoat outside.A.I                               B. you                         C....
Đọc tiếp

1. Mr. Jim said that he............happy with his new assistant.

A. weren’t                   B. wasn’t                     C. isn’t                        D. aren’t

2. Tom said that his parents.............them over for dinner the week before.

A. had visited             B. has visited              C. invite                      D. will visit

3. The little girl said that............didn’t want to wear her raincoat outside.

A.I                               B. you                         C. he                            D. she

4. The Jonhsons said that they..............me an e-mail when they arrived in Nepal.

A. will send                B. send                        C. sent                         D. would send

5. Jane said that she..........her daughter to feel goos about herself.

A. wants                      B. wanted                    C. want                        D. has wanted

6. They wondered.............she would come if it rained.

A. what                       B. if                             C. who                         D. then

7. I..............if hse had ever gone to ha Long Bay.

A. asked                      B. said                         C. requested                D. told

8. He wondered if she lived........with her parents.

A. here                        B. there                       C. in here                    D. in there

9. They...............the train would probably arrive on time.

A. said                         B. told                         C. requested                D. asked.

10. “ Where are you going to spend your holiday?”

A. She asked her friend where was he going to spend his holiday.

B.She asked her friend where he was going to spend his holiday

C.She asked her friend where is he going to spend his holiday

D.She asked her friend where  he is going to spend his holiday

11. Tam asked me how old.............

A. I am                        B. was I                       C. I was                       D. am I

12. Tr Lan asked Mr Ha if he .........be at the meeting.

A. is going to              B. are going to            C. were going to         D. was going to

13. Larry asked Mr. Jonh if he...........time to help him.

A. has                          B. has had                   C. had                          D. will have

2
25 tháng 11 2021

1. Mr. Jim said that he............happy with his new assistant.

A. weren’t                   B. wasn’t                     C. isn’t                        D. aren’t

2. Tom said that his parents.............them over for dinner the week before.

A. had visited             B. has visited              C. invite                      D. will visit

3. The little girl said that............didn’t want to wear her raincoat outside.

A.I                               B. you                         C. he                            D. she

4. The Jonhsons said that they..............me an e-mail when they arrived in Nepal.

A. will send                B. send                        C. sent                         D. would send

5. Jane said that she..........her daughter to feel goos about herself.

A. wants                      B. wanted                    C. want                        D. has wanted

6. They wondered.............she would come if it rained.

A. what                       B. if                             C. who                         D. then

7. I..............if hse had ever gone to ha Long Bay.

A. asked                      B. said                         C. requested                D. told

8. He wondered if she lived........with her parents.

A. here                        B. there                       C. in here                    D. in there

9. They...............the train would probably arrive on time.

A. said                         B. told                         C. requested                D. asked.

10. “ Where are you going to spend your holiday?”

A. She asked her friend where was he going to spend his holiday.

B.She asked her friend where he was going to spend his holiday

C.She asked her friend where is he going to spend his holiday

D.She asked her friend where  he is going to spend his holiday

11. Tam asked me how old.............

A. I am                        B. was I                       C. I was                       D. am I

12. Tr Lan asked Mr Ha if he .........be at the meeting.

A. is going to              B. are going to            C. were going to         D. was going to

13. Larry asked Mr. Jonh if he...........time to help him.

A. has                          B. has had                   C. had                          D. will have

25 tháng 11 2021

1. B
2. A
3. D
4. D
5. B
6. B
7.  A
8. B
9. A
10. B
11. C
12. D
13. C

I. chọn đáp án đúngCâu 1 The weather  ........ cold yesterdayA. aren't          B. isn't            C. wasn't            D. weren'tCâu 2.... you a teacher two years ago? Yes, I.......A. Is/ isn’t   B. Are/aren’t        C. Was/weren’t         D. Were/wasn’tCâu 3:I ... your trip to Nha Trang two years ago.A. remembered      B. remembers       C. remembered          D. RememberCâu 4:Ba ........ the cap all day yesterday.A. wear     B. wears      C. weared        D. WoreCâu 5:He...
Đọc tiếp

I. chọn đáp án đúng

Câu 1 The weather  ........ cold yesterday

A. aren't          B. isn't            C. wasn't            D. weren't

Câu 2.... you a teacher two years ago? Yes, I.......

A. Is/ isn’t   B. Are/aren’t        C. Was/weren’t         D. Were/wasn’t

Câu 3:I ... your trip to Nha Trang two years ago.

A. remembered      B. remembers       C. remembered          D. Remember

Câu 4:Ba ........ the cap all day yesterday.

A. wear     B. wears      C. weared        D. Wore

Câu 5:He ........................ with his parents about his vacation in Da Lat last year.

A. don’t talk     B. doesn’t talked      C. didn’t talked         D. Talked

Câu 6:What.... they ...........last week?

A. do .. play         B. did ... play                 C. do .... played    D. did ..... played

Câu 7:Who ........to about the film on TV last Monday?

A. talk                  B. talks                 C. talked               D. Talking

Câu 8:………… they .........the fish in the big bag last Sunday?

A. Was... put                 B. Were… put               C. Did ... put                  D. Do... put

2
20 tháng 7 2021

I. chọn đáp án đúng

Câu 1 The weather  ........ cold yesterday

A. aren't          B. isn't            C. wasn't            D. weren't

Câu 2..WERE.. you a teacher two years ago? Yes, I...WAS....

A. Is/ isn’t   B. Are/aren’t        C. Was/weren’t         D. Were/wasn’t

Câu 3:I ... your trip to Nha Trang two years ago.

A. remembered      B. remembers       C. remembered          D. Remember

Câu 4:Ba ........ the cap all day yesterday.

A. wear     B. wears      C. weared        D. Wore

Câu 5:He ........................ with his parents about his vacation in Da Lat last year.

A. don’t talk     B. doesn’t talked      C. didn’t talked         D. Talked

Câu 6:What.... they ...........last week?

A. do .. play         B. did ... play                 C. do .... played    D. did ..... played

Câu 7:Who ........to about the film on TV last Monday?

A. talk                  B. talks                 C. talked               D. Talking

Câu 8:………… they .........the fish in the big bag last Sunday?

 

A. Was... put                 B. Were… put               C. Did ... put                  D. Do... put

 

20 tháng 7 2021

A giống C câu 3 vậy

      I.            Ngữ pháp1.        Chọn câu trả lời đúng cho mỗi câu sau          1.1.        My father ………… a teacher. He works in the hospital.A.   is             B. isn’t                  C. are                      D. aren’t          1.2.        I ………… rock music but my brothers don't like it.A.   like          B. likes                 C. don’t like            D. doesn’t like          1.3.        Workers always ………… helmet for safety reason.A.   wear         B....
Đọc tiếp

      I.            Ngữ pháp

1.        Chọn câu trả lời đúng cho mỗi câu sau

          1.1.        My father ………… a teacher. He works in the hospital.

A.   is             B. isn’t                  C. are                      D. aren’t

          1.2.        I ………… rock music but my brothers don't like it.

A.   like          B. likes                 C. don’t like            D. doesn’t like

          1.3.        Workers always ………… helmet for safety reason.

A.   wear         B. wears               C.don’t wear           D. doesn’t wear

          1.4.        I don't like chocolate. I ………… eat it.

A.   never         B. often               C. always                 D. usually

          1.5.        My classmates ………… lazy. They always do their homework.

A.   are              B. is                    C. aren’t                  D. isn’t

          1.6.        My grandfather ………… fishing very often

A.   goes            B. go                  C. don’t go               D. is

          1.7.        ………… tidy your room?

A.   How often are you                              C. How often you    

B.    How often do you                               D. How often does you

          1.8.        Ms. Thuy waters the trees ………… a week.

A.   once              B. one                C. two                      D. one time

          1.9.        What ………… your nationality? I am Vietnamese.

A.   is                   B. are                 C. do                        D. does

       1.10.        I really love making models and my brother ………… it too.

A.   love              B. loves              C. don’t love            D. doesn’t love

4
25 tháng 2 2021

1.B

2.A

3.A

4.A

5.C

6.A

7.B

8.A

9.A

10. D

100% luôn nha

25 tháng 2 2021

   I.            Ngữ pháp

1.        Chọn câu trả lời đúng cho mỗi câu sau

          1.1.        My father ………… a teacher. He works in the hospital.

A.   is             B. isn’t                  C. are                      D. aren’t

          1.2.        I ………… rock music but my brothers don't like it.

A.   like          B. likes                 C. don’t like            D. doesn’t like

          1.3.        Workers always ………… helmet for safety reason.

A.   wear         B. wears               C.don’t wear           D. doesn’t wear

          1.4.        I don't like chocolate. I ………… eat it.

A.   never         B. often               C. always                 D. usually

          1.5.        My classmates ………… lazy. They always do their homework.

A.   are              B. is                    C. aren’t                  D. isn’t

          1.6.        My grandfather ………… fishing very often

A.   goes            B. go                  C. don’t go               D. is

          1.7.        ………… tidy your room?

A.   How often are you                              C. How often you    

B.    How often do you                               D. How often does you

          1.8.        Ms. Thuy waters the trees ………… a week.

A.   once              B. one                C. two                      D. one time

          1.9.        What ………… your nationality? I am Vietnamese.

A.   is                   B. are                 C. do                        D. does

       1.10.        I really love making models and my brother ………… it too.

A.   love              B. loves              C. don’t love            D. doesn’t love

 

23 tháng 10 2021

1. Mary isn’t old enough to do that work.

2. My sister is old enough to drive a car.

3. Robinson isn’t rich enough to buy a house.

4. He wasn’t experienced enough to do the job.

5. You aren’t old enough to have a front– door key.

6. He didn’t have enough money to live on it.

7. He doesn't have enough time to finish this word.

8. My friend is well enough to do it again.

9. My sister wasn’t well enough to go to work.

10. The boy is tall enough to reach the top shelf.

23 tháng 10 2021

mơn nhen =))

 

11 tháng 2 2022

1. As far as I know, he is still working in Korea.

→ To the best of my knowledge, he is still working in Korea.

2.  We weren’t surprised by his success.

→ It came as no surprise to us that he had succeeded

3. They cancelled the flight because of the heavy rain.

→ So heavily was the rain that They cancelled the flight

4. He isn’t present at the meeting, and I’m not either.

→ Neither he nor I am present at the meeting

5. I only understood very little of what my teacher said.

→ I could hardly understand what my teacher said

1. Although he has high salary, he isn’t interested in the job.A. Despite having high salary, he wasn’t interested in the job.B. In spite of having high salary, he isn’t interested in the job.C. Despite being interested in the job, he doesn’t get high salary.D. In spite of having high salary, he is satisfied with the job.2. The trees get enough water and sun light. It grows faster.A. If the trees get enough water and sun light, it will grow faster.B. The trees wouldn’t grow because it didn’t...
Đọc tiếp

1. Although he has high salary, he isn’t interested in the job.

A. Despite having high salary, he wasn’t interested in the job.

B. In spite of having high salary, he isn’t interested in the job.

C. Despite being interested in the job, he doesn’t get high salary.

D. In spite of having high salary, he is satisfied with the job.

2. The trees get enough water and sun light. It grows faster.

A. If the trees get enough water and sun light, it will grow faster.

B. The trees wouldn’t grow because it didn’t get enough water and sun light.

C. Because the trees doesn’t get enough water and sunlight, it doesn’t grow fast.

D. If the tree got enough water and sun light, it would grow faster.

3. The goverment have sent food and medical supplies to the victims of the flood.

A. Food and medical supplies have been sent to the victims of the flood by the goverment.

B. Food and medical supplies has been sent to the victims of the flood by the goverment.

C. Food and medical supplies are sent to the victims of the flood by the goverment.

D. Food and medical supplies were sent to the victims of the flood by the goverment.

4. It takes me 15 minutes to walk to the nearest post office.

A. I spend 15 minutes walking to the nearest post office.

B. I spent 15 minutes walking to the nearest post office.

C. It took me 15 minutes to walk to the nearest post office.

D. I don’t need much time to walk to the nearest post office.

5. Mary are typing an important document for this event.

A. An important document is typed for this event by Mary.

B. An important document is being typed for this event by Mary.

C. An important document was being typed for this event by Mary.

D. Mary types an important document for this event by Mary.

6. Today is Monday. We have to go to work earlier.

A. If today weren’t Monday, we would have to go to work earlier.

B. We don’t like Monday because we have to go to work earlier.

C. We don’t need to go to work earlier since today is Monday.

D. We wouldn’t have to go to work earlier if today weren’t Monday.

7. Australia/ the/ biggest/ has/ cattle/ in/ the/ station/ world.

A. Australia has the biggest station cattle in the world.

B. Australia has biggest cattle station in the world.

C. Australia has the biggest cattle station in the world.

D. In the world, Australia has biggest cattle station.

2
25 tháng 3 2022

1. Although he has high salary, he isn’t interested in the job.

A. Despite having high salary, he wasn’t interested in the job.

B. In spite of having high salary, he isn’t interested in the job.

C. Despite being interested in the job, he doesn’t get high salary.

D. In spite of having high salary, he is satisfied with the job.

 

2. The trees get enough water and sun light. It grows faster.

A. If the trees get enough water and sun light, it will grow faster.

B. The trees wouldn’t grow because it didn’t get enough water and sun light.

C. Because the trees doesn’t get enough water and sunlight, it doesn’t grow fast.

D. If the tree got enough water and sun light, it would grow faster.

 

3. The government have sent food and medical supplies to the victims of the flood.

A. Food and medical supplies have been sent to the victims of the flood by the government.

B. Food and medical supplies has been sent to the victims of the flood by the government.

C. Food and medical supplies are sent to the victims of the flood by the government.

D. Food and medical supplies were sent to the victims of the flood by the government.

 

4. It takes me 15 minutes to walk to the nearest post office.

A. I spend 15 minutes walking to the nearest post office.

B. I spent 15 minutes walking to the nearest post office.

C. It took me 15 minutes to walk to the nearest post office.

D. I don’t need much time to walk to the nearest post office.

 

5. Mary are typing an important document for this event.

A. An important document is typed for this event by Mary.

B. An important document is being typed for this event by Mary.

C. An important document was being typed for this event by Mary.

D. Mary types an important document for this event by Mary.

 

6. Today is Monday. We have to go to work earlier.

A. If today weren’t Monday, we would have to go to work earlier.

B. We don’t like Monday because we have to go to work earlier.

C. We don’t need to go to work earlier since today is Monday.

D. We wouldn’t have to go to work earlier if today weren’t Monday.

 

7. Australia/ the/ biggest/ has/ cattle/ in/ the/ station/ world.

A. Australia has the biggest station cattle in the world.

B. Australia has biggest cattle station in the world.

C. Australia has the biggest cattle station in the world.

D. In the world, Australia has biggest cattle station.

25 tháng 3 2022

1. Although he has high salary, he isn’t interested in the job.

A. Despite having high salary, he wasn’t interested in the job.

B. In spite of having high salary, he isn’t interested in the job.

C. Despite being interested in the job, he doesn’t get high salary.

D. In spite of having high salary, he is satisfied with the job.

2. The trees get enough water and sun light. It grows faster.

A. If the trees get enough water and sun light, it will grow faster.

B. The trees wouldn’t grow because it didn’t get enough water and sun light.

C. Because the trees doesn’t get enough water and sunlight, it doesn’t grow fast.

D. If the tree got enough water and sun light, it would grow faster.

3. The goverment have sent food and medical supplies to the victims of the flood.

A. Food and medical supplies have been sent to the victims of the flood by the goverment.

B. Food and medical supplies has been sent to the victims of the flood by the goverment.

C. Food and medical supplies are sent to the victims of the flood by the goverment.

D. Food and medical supplies were sent to the victims of the flood by the goverment.

4. It takes me 15 minutes to walk to the nearest post office.

A. I spend 15 minutes walking to the nearest post office.

B. I spent 15 minutes walking to the nearest post office.

C. It took me 15 minutes to walk to the nearest post office.

D. I don’t need much time to walk to the nearest post office.

5. Mary are typing an important document for this event.

A. An important document is typed for this event by Mary.

B. An important document is being typed for this event by Mary.

C. An important document was being typed for this event by Mary.

D. Mary types an important document for this event by Mary.

6. Today is Monday. We have to go to work earlier.

A. If today weren’t Monday, we would have to go to work earlier.

B. We don’t like Monday because we have to go to work earlier.

C. We don’t need to go to work earlier since today is Monday.

D. We wouldn’t have to go to work earlier if today weren’t Monday.

7. Australia/ the/ biggest/ has/ cattle/ in/ the/ station/ world.

A. Australia has the biggest station cattle in the world.

B. Australia has biggest cattle station in the world.

C. Australia has the biggest cattle station in the world.

D. In the world, Australia has biggest cattle station.

14 tháng 12 2021

1.They are painting the living room light blue

The living room light blue is being painted .

2. They aren’t painting the living room light blue.

The living room light blue isn't being painted .

3. Are they painting the living room light blue?

Is the iving room light blue is being painted?

4. Lan  is cleaning the floor at the moment.

The floor is being cleaned by Lan at the moment.

5.Lan isn’t  cleaning the floor at the moment.

The floor isn't being cleaned by Lan at the moment.

6.Is Lan cleaning the floor at the moment

Is the floor is being cleaned by Lan at the moment?

7. What is he doing now ? 

Is he being done now?

8 . Look ! The mechanic is repairing my car.

Look! My car is being repaired by the mechanic

Rewrite these sentences in other ways so that the meaning is unchanged. (1.5pts)1. Nick sneezes so much because the air is dirty.→ If the air weren’t/ wasn’t....................................................2. They have provided fresh water for people in the drought areas.→ Fresh water............................................3. “I have never been to an English speaking country before.” She said.→ She said that..................................4. There is a train leaving at 10.00 this...
Đọc tiếp

Rewrite these sentences in other ways so that the meaning is unchanged. (1.5pts)

1. Nick sneezes so much because the air is dirty.→ If the air weren’t/ wasn’t....................................................

2. They have provided fresh water for people in the drought areas.→ Fresh water............................................

3. “I have never been to an English speaking country before.” She said.→ She said that..................................

4. There is a train leaving at 10.00 this evening.→  The train …………………………

5. Last week, we visited Ha Long. Then we came back Hanoi.→  Last week, before we .....

6. “I come from a small town in Vietnam” Nga said.

- Nga said..............................................................................................................

7.  The tornado destroyed the building last week.

- The building...............................................................................................................

8. “Do you go to school every weekday?” She asked him.

- She asked him ...........................................................................................................

9. Study hard and you will get good results in your exam.

- If……………………………………………………………………………….

10. “Where will you go for the holiday this year?” He asked me

- He asked me ……………………………………………………………..

11. Tom said: “I want to buy a pocket calculator.”

-> Tom said that.................................................................................................

12. Littering rubbish can cause soil pollution.

-> Soil pollution..................................................................................

13. They had visited Hue Citadel before they went to Hoi An.

-> After they.....................................................................................

14. You should choose the blue car instead of the red one.

-> If I ..............................................................

15. If he doesn't get up early, he will be late for school.

-> Unless ...............................................................................................

16. Hong can’t buy a new computer because she doesn’t have enough money.

=>If Hoa ……………………………………………………………………………..

17. "I'm working in a restaurant now" She said.

=> She said that ……………………………………………………………………

18. "I want to be a footballer." Tom said.

=> Tom said that ………………………………………………………………

19. People use computers in all corners of the world.

  => Computers .......................................................................................................

20. Work hard and we will pass the exam.

=> If we ...................................................................................................................

1
7 tháng 5 2022

Rewrite these sentences in other ways so that the meaning is unchanged. (1.5pts)

1. Nick sneezes so much because the air is dirty.→ If the air weren’t/ wasn’t dirty, Nick wouldn't sneeze so much.

2. They have provided fresh water for people in the drought areas.→ Fresh water has been provided for people in the drought areas.

3. “I have never been to an English speaking country before.” She said.→ She said that she had never been to an English speaking country before.

4. There is a train leaving at 10.00 this evening.→  The train which will be leaving at 10.00 this evening.

5. Last week, we visited Ha Long. Then we came back Hanoi.→  Last week, before we came back Hanoi, we had visted Ha Long.

6. “I come from a small town in Vietnam” Nga said.

- Nga said she came from a small town in Vietnam.

7.  The tornado destroyed the building last week.

- The building was destroyed by the tornado last week.

8. “Do you go to school every weekday?” She asked him.

- She asked him if he went to school every weekday.

9. Study hard and you will get good results in your exam.

- If you study hard, you will get good results in your exam.

10. “Where will you go for the holiday this year?” He asked me

- He asked me where I would go for the holiday that year.

11. Tom said: “I want to buy a pocket calculator.”

-> Tom said that he wanted to buy a pocket calculator.

12. Littering rubbish can cause soil pollution.

-> Soil pollution can be caused by littering rubbish.

13. They had visited Hue Citadel before they went to Hoi An.

-> After they had visited Hue Citadel, they went to Hoi An.

14. You should choose the blue car instead of the red one.

-> If I were you, I would choose the blue car instead of the red one.

15. If he doesn't get up early, he will be late for school.

-> Unless he gets up early, he will be late for school.

16. Hong can’t buy a new computer because she doesn’t have enough money.

=>If Hoa had enough money, she could buy a new computer.

17. "I'm working in a restaurant now" She said.

=> She said that she was working in a restaurant then.

18. "I want to be a footballer." Tom said.

=> Tom said that he wanted to be a footballer.

19. People use computers in all corners of the world.

  => Computers are used in all corners of the world.

20. Work hard and we will pass the exam.

=> If we work hard, we will pass the exam.