A)用括号中所给单词的适当形式填空。21. Everyone is supposed ________ (wear)a seat belt in the car.

22. I have many difficulties in learning English. Who can give me some　　　(suggestion)?

23. The Changjiang River is one of the 　　　　　　　(long) rivers in the world.

24. My neighbours are very 　　　　　　　(friend) to us.

25. Li Yang, your　 　　　　　　　　(pronounce) is not good. You should improve it. B)根据句意及所给汉语意思写出所缺单词。

27. Tom 　　　　　　　　　(邀请) all his best friends to his birthday party last Sunday.

28. “Help　　　　　 　(自便) to some fish.” Mum said to my friends..

29. We shouldn't throw rubbish 　　　　　　　　　(到处) to protect the environment.

30. Bob has many story books and he often 　　　　　　　　(分享) them with his friends.

31.(　 ) —What ________ cold weather! 　 　　　—Yes. But it’s _____ unusual experience for us, and we normally live in a hot place. 　 　　　　A. the; an　　 　　B. a; an　　　 　　C. a; the　　　　 D. /; an