二 选择填空 从下列每题所给的选项中选出一个最佳答案（共15小题；每小题1分，满分15分）
31. It is clever __________you __________ out the problem.
A. for; to work B. of; working C. to; working D. of; to work
32. I think your advice is of great ______ to me and it’s__________.
A. valuable; worth giving B. valuable; worth taking it
C. value; worth giving it D. value; worth taking
33. Can you imagine what the world _____ like if ______ no computers?
A. is; there will be B. will be; there is C. are; there will be D. will be; there are
34. ——Is John coming by train?
——He should, but he _______ not. He likes driving his car.
A. must B. can C. may D. need
