1. 用所给词的适当形式填空

1. （1） The clothes in this shop are the (cheap) in the city.

3. （2） China is one of the (old) countries in the world.

5. （3） Shanghai is (big) city in China.

7. （4） The book is much (interesting) than that one.

9. （5） They want to finish the work with fewer people and (little) money.

11. （6） Mike is (heavy) of all the boys.

13. （7） The Yellow River is the second  (long) river in China.

15. （8） Tom works as  (careful) as his brother.

17. （9） Of the two bags, the brown one is (expensive).

19. （10） The higher the mountain is, the (thin) the air is.