=>
1/
1. whose
2. If
3. advised
4. on
5. wear out
6. Although
2/
1. C polluted since there is too much traffic.
2. F amazed that you won the first prize.
3. A cancelled as Mr.Tan's plane was late.
4. G I had to learn hard.
5. D organizing a show to raise money for the poor.
6. B reading the book and went to bed.
3/
1. protection
2. rainy
3. go
4. famous
5. choice
6. is being sung
7. were playing
8. taking
4/
1. will -> would
2. taking -> take
5/
1. having enough qualifications
2. he was taking
3. has to be finished
4. whose car had broken
6/
1. invented
2. popular
3. inexpensive
4. development
7/
1. F
2. T
3. T
4. F
