(2013·新课标Ⅰ，32)There's no way of knowing why one man makes an important discovery________another man，also intelligent，fails.
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A
since
B
if
C
as
D
while
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On the long journey, Peter ________ a most interesting guide．We all had a wonderful time．
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A
practiced
B
behaved
C
proved
D
conducted
It is believed that the construction of a highway will _____ the growth of the suburbs.
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A
increase to
B
contribute to
C
keep to
D
take to
The project will cost a lot of money but it will ____ the company in the long run.
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A
limit
B
harvest
C
benefit
D
celebrate
Alice trusts you; only you can ________her to change her mind.
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A
suggest
B
attract
C
persuade
D
attempt