题目内容

It is no use____ a child to do what he is unwilling to do.

A. asked
B. to ask
C. asking
D. ask

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There is no doubt that_____ the environment is imperative.

A. protecting
B. be protected
C. protect
D. to protect

____ a great contribution to his country, Tom was awarded a medal of honor bythe government.

A. Have made
B. Made
C. Having made
D. Making

When guests or friends come to our home, the etiquette of____and________ teais indispensable.

A. make; serve
B. making; serving
C. made;served
D. having made; having served

Lilys sudden__ made her parents hard to accept.

A. leaves
B. left
C. leaving
D. to leave

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