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______ it have been the failure to pick up directions from the ground control that caused the air crash?

A．Must

B．Could

C．Would

D．Should

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_______, we continued our way.

A．As terrible the storm was	B．Terrible as the storm was
C．As terrible was the storm	D．Terrible the storm as was

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________ in Tibet for ten years, he has been accustomed to the life and the climate there.

A．He has worked	B．Having worked
C．He has been working	D．Working

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Look! What a mess the room is! In my opinion, it needs ______.

A．cleaning up

B．being cleaned up

C．to clean up

D．clean up

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--- Don’t waste any paper, because our forests ____ every day.
----Sorry, I didn’t know that.

A．decreased

B．had decreased

C．have decreased

D．are decreasing

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The child, who has a gift for sports, might make a first-class tennis player if given chances to develop her ______.

A．courage

B．habit

C．potential

D．sense

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