根据材料回答题,Smoking, which may be a pleasure for some people, is

根据材料回答题,Smoking, which may be a pleasure for some people, is a serious source of

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The road will be blocked if there _______ another snow.

The road will be blocked if there _______ another snow. A.is B.will be C.to be D

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Human beings should find a new _______ of energy.

Human beings should find a new _______ of energy. A.orient B.source C.origin D.s

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We've all heard of Thomas Edison, _______ who invented the e

We've all heard of Thomas Edison, _______ who invented the electric light and ma

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He regretted _______the decision too hastily.

He regretted _______the decision too hastily. A.make B.to make C.making D.have m

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