Although metals________widely in qualities such as strength and hardness,they al

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Although metals________widely in qualities such as strength and hardness,they all have certain qualities in________.[     ]
A. vary；general
B. differ；common
C. react；particular
D. refer；detail

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举一反三

The policeman________the children to cross the road when the traffic lights turned green.[     ]
A. let
B. made
C. signaled
D. called

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—How are the team playing?
—They"re playing well, but one of them________hurt.[     ]
A. got
B. had
C. turned
D. become

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More and more trees should be planted in spring to________sandstorms happening frequently.[     ]
A. protect
B. prevent
C. keep
D. care

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You should________your spare time better if you want to be promoted.[     ]
A. take
B. employ
C. cost
D. improve

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Teacher"s words and deeds______a great effect________their students.[     ]
A. have; on
B. give; to
C. make; in
D. take; to

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