单项选择题

By （） computation, he estimated that the repairs on the house would cost him a thousand dollars.

A.coarse
B.rude
C.average
D.general

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The （） on this apartment expires in a year's time.

A.treaty
B.engagement
C.lease
D.subsidy
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Very few scientists （） completely new answers to the world's problems.

A.come up with
B.come out
C.come round
D.come up to
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