29. The post office is ______ the street corner.

28. Our English teacher lives _______ the end of Zhongshan Road.

27. There are many shops close ______ my home.

26. You can call me ________ 637-8412.

25. The math problem is _______ (real) difficult.

C)请用适当的介词填空，完成下列句子。

24. Many people are moving from ________(city) to suburbs.

23. I hear Li Yundi _________ (play) the piano (钢琴) now.

22. Some ________ (child) are playing soccer over there.

21. It’s too ______ (noise) on the playground. Let’s go to the classroom to read the letter.

20. People usually keep their money in the b________.

B)请用括号中所给单词的适当形式填空，完成下列句子。