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This nationwide smog should serve as a reminder to all, indicating a high time that we ______ on what we've done to the environment.

A．have reflected

B．are reflecting

C．will reflect

D．reflected

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The little boy was in danger. The doctors and nurses are doing him.

A．what they can do help	B．everything they can help
C．what they can to help	D．all what to help

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_______ the end of last term, we had learned 3,000 English words.

A．At

B．By

C．To

D．On

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Through the satellites, we can send and _______ messages.

A．pick up

B．pick out

C．take up

D．take in

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All is needed is a Supply of oil．

A．the thing

B．that

C．what

D．which

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--When _________ the training course begin?
--Next Monday.

A．has

B．is going to

C．does

D．did

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