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II

1. if i were you, i would recycle these plastic carrier bags 

2. the pilots' sudden strike so all flights had to be cancelled

3. the polluted environment causes birds and plant die 

4. the contaminated food leads to poor people's health 

XI

1. bad weather mde it impossible for the plane to be touch down 

2. my brother is fond of science fiction books very much

3. peter said that he had already seen the new tech exhibition 

4. water pollution lead to many aquatic animals die 

5. a household chores will be easily handle in the near future

find 

1.a => had read  2. b=> spent  3. a=> interesting   4. c=> bought ( bị động )

5. d=> was improved   6. b=> would ( đk loại 2 )   7.b=> hadn't seen