6. I suggest we should take a shower instead of a bath.

7. I suggest going to school or to work by bike to save energy.

8. I suggest that we should reuse and recycle empty bottles to save natural resources.

9. Unless you come soon, we may not meet you.

10. Unlesss we recycle bottles and cans, we will not save a lot of natural resources.

11. Unless he arrives, we will start the conference without him.

12. Unless we use much pesticide on vegetables, the vegetables will not become poisonous.

13. I like reading books which tell about the differnent cultures. 

14. The purse which she has lost last week was found yesterday.

15. We often go to the town cultural house which always open on public holidays.

16. We had the birthday party which was the most expensive in the city in the restaurant.

IX

1. The waitress who served us dinner yesterday was friendly.

2. Neil Armstrong, who first walked on the moon, lived in the USA.

3. The car which he has just bought is very expensive.

4. Mr Brown, who songs English very well, is my El teacher.

5. The girl who lived next door to us is very friendly.

6. Although he has broken a leg, he is playing football with his friends.

7. Although it rained heavily yesterday, I went on a picnic ......

8. Although she wasn't beautiful, she took part in a beauty contest.