=>

VI/
1. He said that he liked to do physics experiments.
2. Many natural disasters have been caused by global warming.
3. Noise pollution causes a change in animals’ living pattern.
4. If people didn't throw rubbish in the street, the treet would look attractive.
5. The pilots suddenly went on a strike, so all flights had to be cancelled.

VI/
1. My sister doesn't cook as well as my brother.
2. After I had had breakfast at home , I went to school.
3. Oliver said to Chau that he was going to Viet Nam the following day.
4. Despite the terrible storm, no one was injured.
5. If today were Sunday, I wouldn't have to go to school.

II/

1. has been played

2. hasn't been

3. is watching

4. would go

5. to give up