单项选择题

Most people thought that these competitors didn't ______ their prizes because they cheated in the competition.

A．conserve
B．preserve
C．deserve
D．observe
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单项选择题
So long as we put our heads together, I'm sure that we will certainly find a(n) ______ to the problem.
A．approach
B．key
C．answer
D．solution
单项选择题
His dedication ______ the cause of education earned him the respect of his colleagues.
A．to
B．about
C．in
D．into
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