35. We will debate the subject ______ later when we have enough time.

A. in vain　　　　 B. at length　　　 C. at last　　　　 D. in force

34. --How much can you pay me for the service, sir?

--You ______ $200, if you do nicely.

A. will pay　　　 B. are paying　　 C. will be paid　　 D. are paid

33. We ______ here at lunch time; we were delayed at the airport, though.

A. could be　　　　　　　　　　　 B. should be

C. must have been　　　　　　　　 D. would have been

32. The scientist delivered a report on ______ there was little snow last year in North China.

A. why　　　　　 B. that　　　　　 C. how　　　　　 D. what

31. With proper measures, the economy in China is beginning to _______ again.

A. rise up　　　　 B. pack up　　　 C. pick up　　　 D. take up

30. While many teachers have welcomed the efficient class, some are still ______ about its results.

A. sceptical　　　 B. explicit　　　 C. sensitive　　　 D. certain