Therearealotofcomputersinthela

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There are a lot of computers in the lab,and they need professional　　to make sure they can be in a good state.

A．operation	B．maintenance
C．service	D．advice

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Ladies and gentlemen, please fasten your seat belts. The plane ______..

A．take off	B．is taking off
C．has taken off	D．took off

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. It is so nice to hear from her. ______, we last met more thirty years ago.

A．What’s more	B．That is to say
C．In other words	D．Believe it or not

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----You haven’t done it well.
----But I tried my best and did it ______ the way ______ I thought was the best.

A．in, which	B．by, in which
C．by, in that	D．in, what

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Go back home now, Mary. Your parents ______ your safety.

A．are concerned about	B．are concerned with
C．are concerned on	D．concern of

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Must I wait till you come back? No, you ______.

A．mustn't	B．needn't
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