二、把下面的定语从句拆分成两个句子。

1、This is the professor who taught me chemistry in 1980 .

2、Do you know the student who was praised at the meeting?

3、This is the boy whose father died three years ago.

4、The film we saw the day before yesterday is very interesting.

5、The hospital which was built five years ago was destroyed in this earthquake.

6、They work in a factory which makes radio parts.

7、She lives in a small village, which is only three miles away from here.

8. I bought an ancient painting whose price is very high.

9. Nobody wants the house whose roof has fallen in.

10. This is the old man whose son went abroad.

11. Have you seen the film whose leading actor is Xu Zheng?

12. A man who is completely satisfied with the present situation is a failure.

13. He bought a house whose windows are made of wood.

14.The doctor that you are looking for is in the room.

15.The building which stands near the river is our school.

三．把下列各组句子合并成一句

（A）

1. This is the factory. It makes good quality machine.

2. Do not drink water. It has not been boiled.