21.—Do you think we’ll still catch the train?

　　— Well, we won’t we walk faster.

　　A. as B. unless C. until D. no matter how

　　22. —Do you mind if I smoke here?

　　— .

　　A. No, please don’t B. Yes, please

　　C. No, not at all D. Yes, if you like

　　23. —May I move your bag a little and take this seat?

　　— .

　　A. I don’t mind B. Go ahead C. It doesn’t matter D. You do it, please

　　24. —When will you be free this month, Mr. White?

　　— , maybe we’ll be free next Sunday.

　　A. Let me be B. Let me see C. Think it over D. I’m afraid

　　25. —May I come to attend your lecture?

　　— .

　　A. No, you’d better not come B. Sure

　　C. It’s not worth listening to D. My pleasure

　　26. He said he had bought dictionary week before, and

　　dictionary was great help to him.

　　A. a…the…the…a B. a…/…the…/

　　C. a…/…/…a D. the…the…the…the

　　27. Mr. Brown, together with his students, to the Science Museum.

　　A. has gone B. are going C. have gone D. have been

　　28. Although he was in a hurry, he stopped the old man to carry the heavy box.

　　A. helping B. to help C. being helped D. helped

　　29. During the holidays I shall help my father .

　　A. with working B. with his work C. for work D. for working

　　30. —Where on earth do we get light and heat?

　　—It is from the sun we get them.

　　A. which B. on which C. where D. that