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21、-----What is troubling you?

----I don’t know _______.

A. who to ask advice                 B. who am I to ask for advice

C. whom to turn to for advice    D. whom to turn for advice

20、This kind of cloth _______ well. I think it is worthy ________.

A. washes; buying                 B. is washed; buying

C. washes; to be bought        D. is washed; to be bought

19、______has the children burdened with too much homework nowadays?

A. It is who that                      B. Who is it that

C. It was who that                  D. Who was it that

18、----Don’t take it __________. Everything will be all right.

----But I’m really worried about his safety.

A. serious                                         B. seriously

C. lightly                                         D. easy

17、At that time they were still _____a lot of discriminating laws ______choice of jobs and so on.

A. subject to; regarding                     B. obedient; as regards

C. object to; as to                             D. opposed; as for

16、I’d like ________on a trip to Tibet while he prefers_______ to Guilin.

A. to take; to go                             B. to be taken; to go

C. to take; going                            D. to be taken; to be going

15、It is certain that he will__________ his business to his son when he gets old.

A．take over      B．think over      C．hand over                D．go over

14、The fact that the insects living on these plants died out _______produced less food supply for birds and wolves.

A. in return       B. in place         C. in turn                      D. in the end

13、-----Oh, what a pretty car it is! By the way, are you planning to buy one?

-----Sure. But now I haven’t enough money ______to buy one.

A. for which                                          B. with which

C. by which                                          D. on which

12、No sooner ______home _______I told him the exciting news.

A. had he got; when                               B. had he got; than

C. he had got; when                               D. he had got; than