7.　 When the accident took place, it happened/chanced that (恰巧) he wasn’t on the bus.

6.　 An accident happened to Mary. That’s why she didn’t go to school yesterday (她昨天没有上学的原因).

5.　 A computer can only do the things that you have instructed it to do.

A computer can only do what you have instructed it to do.

B. 完成句子

4.　 The old couple seemed to have known the bad news.

It seemed that the old couple had known the bad news.

3.　 The person that discovered America is well known to us all.

Who discovered America is well known to us all.

2. Mr. Zhang killed himself on April Fool’s Day.

　It was on April Fool’s Day that Mr. Zhang killed himself.

1. To deal with this physics problem is difficult for him.

It is difficult for him to deal with this physics problem.

10. The taxi driver decided to find out whose the cellphone was.

9. Can you tell me whom/who the computer on the desk belongs to?

8. Go and get your dictionary. It’s where you left it.