单项选择题

China is one of the few countries in the world that have devoted great efforts to________ world peace.

A．preserving
B．conserving
C．possessing
D．reserving
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单项选择题
Cats sleep________day and hunt________night.
A．in, in
B．at, at
C．during, during
D．by, by
单项选择题
It was not an easy job for the police to find out the murderer, because no________had been found yet.
A．hint
B．clue
C．trace
D．track
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