第二部分英语知识运用（共两节，满分35分）
第一节 单项填空（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答案。
21. Historically, ______ main material for making tables has been wood, but ______ metal and stone have also been used.
A. the; / B. /; / C. the; the D. /; the
22. ---Who is making so much noise in the garden?
---______ the children.
A. They are B. There are C. It is D. Those are
23. ---Could you tell me the way to the zoo?
---Follow me, please. I happen ______ there, too.
A. to have been B. to have gone C. to be going D. going
24. ---Cliff, I lost your bike at school. I suppose I should pay for it.
---Oh, ______. It was an old bike anyway.
A. take it easy B. OK C. don’t say so D. forget it