一、单项填空（共20小题；每小题1分，满分20分）
21.--Do you mind my smoking here? -- . Look at the sign. It says, "No Smoking."
A. Of course not B.You'd better not C.No,I don't
22.I don't quite catch what you said at the meeting. Here "catch" mean ．
A. miss B.hear C.understand
23.--Must I get up early tomorrow morning? --No, you . A. mustn't B.needn't C.can't
24.--May I use your pen? --Sure. Here are two and you can use of them.
A．both B．any C．either
25.--Suining is becoming more and more beautiful! -- Yes. Lots of trees and flowers these years.
A. are planted B.will be planted C.have been planted
