—Whatapity!Theirexperimentisaf

—What a pity! Their experiment is a failure.
—They ________ better under more favorable conditions.

A．should have done	B．could have done
C．must have done	D．may have done

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We human beings should be very careful with what we do with nature, _____power is beyond our understanding.

A．that	B．which
C．whose	D．where

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（）I found the lecture hard to follow because it ____ when I arrived.

A．started	B．was starting
C．would start	D．had started

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I haven’t finished my report, but I promise I ______ it by the end of the week.

A．will finish	B．have finished
C．will be finishing	D．will have finished

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It's a custom in China to have some tea or other drinks before the meal ________.

A．serves	B．served
C．was served	D．is served

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—What’s all that noise about outside?
—Oh, I forgot to tell you. The road to the railway station ______.

A．will be widened	B．is to be widened
C．has been widened	D．is being widened

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