二. 单项选择（共15小题；每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. — Will you do me a favour and fetch some chalk?
— ____
A. Help yourself. B. With pleasure. C. Congratulations！ D. I’ve no idea.
22. A driver should __ the road when .
A. concentrate on; drive B. concentrate in; driving
C. concentrate to; drove D. concentrate on; driving
23. Tom kept quiet about the accident ________ lose his job.
A. so not as to B. so as not to C. so as to not D. not so as to
24.The poor man , ________，ran out of the dark cave.
A. tiring and frightened B. tired and frightened
C. tired and frightening D. tiring and frightening
25. The boy wanted to ride his bicycle in the street, but his mother told him ____.
A. not to B. not to do C. not to do it D. do not to
26. As a result of the serious flood, two-thirds of the buildings in the area _____.
A. need repairing B. needs to repair C. needs repairing D. need to repair
27. ---“Did you have any difficulty in today’s homework?”
---“No, in fact I found __________.”
