I.

1. joined - was

2. had studied

3. wrote

4. left

5. were playing

6. was discovered

7. saw

8. was playing - arrived

9. went - were having

10. were - doing

IV.

1. Police must punish him because he has driven too fast.

2. Tom is trying to learn English as he wants to travel to England.

3. My class was happy since we won the football match last Saturday.

4. Her parents were extremely worried because she couldn't pass the entrance exam.

5. Air is polluted seriously as people don't know how to protect the forests.

6. People shouldn't drink too much wine before driving since there may be accidents.

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I.

1. will play

2. cooks

3. will rehearse

4. will design

5. help

6. won't live

7. is

8. won't have

9. will read

10. buys

II.

1. My children enjoy watching television.

2. She finishes writing the report.

3. It just stopped raining.

4. The workers keep on building that tower.

5. His pen pal looks forward to seeing her in the summer.

6. She is practicing playing the piano at the moment.

7. I like using the Internet in my free time.

8. My younger sister and brother love watching cartoons very much.

III.

1. You don't like watching sports, do you?

2. Your uncle is a journalist, isn't he?

3. You haven't sent e-cards to your friends, have you?

4. Ms Scott won't teach us, will she?

5. There are different magazines to sell, aren't there?

6. Mary met you last night, didn't she?

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I.

1. is painting

2. was reading

3. were you watching

4. was waiting

5. wasn't driving

6. were you doing

7. was wearing

8. were playing

9. am looking

10. are shouting

II.

1. nervous

2. fluently

3. interesting

4. exciting

5. heavily

6. well

III.

1. fast

2. coldly

3. happy

4. slow

5. clearly

6. strictly 

I)

1)My brother joined the army when he was young

2) Tom has studied chemistry for three years and then he gave up

3) Miss Lee often writes when she was on holiday

4) He left home two weeks ago 

5) When the teacher came in the pupils played games

6)Comblus discoverd America more then 400 years ago

7) I last seen him last sunday

8)She played the piano when our guest arrived last night 

9)The light gone out when we have dinner 

10)What did you do at 7PM last night 

IV)

1) Police must punish him ,since he has driven too fast

2) Tom is trying to learn English , because he wants to travel England

3)My class was happy ,as ( mik ko chắc đâu )we won the football match last night

4) Her parents were extremely worried  ,because she could not pass the entrance exam

5) Air is polluted seriously, as people don't know how to protect the forest

6) People should not drink much wine before driving , because there may be accidents