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16.Suppose there were a flood or an earthquake and the people could not be reached by trains or trucks._______ packages of food could be dropped from planes, the people might starve.A.Until

B.Before

C.Unle

D.If only

17.Mary has long had the desire _______ a famous writer even though the study of writing would require years of sacrifice on her part.A.for becoming

B.to become

C.of becoming

D.becoming

18.This is so difficult a problem that the scientist is known to _______ on it for about ten years, but hasn’t found a solution yet.A.have worked

B.have been working

C.be working

D.work on

19.A majority _______ collectively may be regarded as a being whose opinions and, most frequently, whose interests are opposed to those of another being, which is styled a minority.A.taking

B.takes

C.take

D.taken 中公考研 http://www.daodoc.com