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