20. Math ______ one of the ______ subjects in middle schools.

A. are; important B. is; most important

C. is; more important D. are; much important

IV. 单句改错。(10分)

19. We can't live ______ air.

A. without B. with C. to D. out

18. I think Liu Dehua is one of the ______ movie stars in China.

A. popular B. popularest C. more popular D. most popular

17. ______, English, math or Chinese?

A. What do you like best B. Which do you like best

C. What do you like better D. Which do you like better

16. The box is ______ of all.

A. heaviest B. the bigest C. the heavier D. the biggest

15. This storybook is ______ (interesting) of the three.

III. 选择填空。(10分)

14. Today is a fine day. It is ______ (fine) day in this week.

13. The basket is ______ (heavy) of all. Let me carry it.

12. Who is ______ (tall), Ann, Meimei or Mary?

11. Autumn is ______ (good) season in a year.