31. We were (amaze) at how knowledge able he is.

27. It is necessary ( give) him a call at once?

28. Let the twins (do) it.

25. English (speak) worldwide.

26. Lin Tao is good at (play) football.

V.當所給詞為動詞時，應(yīng)注意動詞的時態(tài)或語態(tài)的變化，動詞的非謂語形式的固定搭配，動詞和名 詞的相互轉(zhuǎn)化，動詞和形容詞的相互轉(zhuǎn)化等。

23. Li Hua (work) in the factory since she left school ten years ago.

24. Tomorrow is Sunday. We (have) a field trip.

21. There are about eight (hundred) students in our school.

22. They saw (thousand) of birds in the tree.

IV.當所給詞為數(shù)詞時，應(yīng)注意基數(shù)詞與序數(shù)詞的相互轉(zhuǎn)化、表示數(shù)位名稱的詞的形式等。

19. July is the (seven) month of a year.

20. Two ( three) of the chairs in the meet ing hall are new.

18. The river running across the countryside is (heavy) polluted.

16. We have a lovely room. It's one of (nice) in the hotel.

17. What have you been busy with (re cent) ?

14. Ann writes as (careful) as Han Meimei.

15. —How about this sweater?

—It's much than that one. (expensive)

Ⅲ.當所給詞為形容詞或副詞時，應(yīng)注意其原級、比較級、最高級的變化。還應(yīng)注意形容詞與其副詞形式之間的轉(zhuǎn)化。

12. Kate did badly in the exam. Sun Hong did even (badly) .

13. Yang Yang is (strong) in our class.