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A number of tests have been conducted to _________ that these drugs have no side effects.

A．find out

B．look for

C．make sure

D．work out

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To turn off my cell phone before going to bed seems to be a rule .

A．to never break	B．never to have broken
C．never to be broken	D．never to be breaking

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—Did you have any trouble in getting here ?
— No . I would have telephoned you .

A．However

B．Otherwise

C．Therefore

D．Anyway

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There were so many cars held up by the heavy rain on the road that we had no but to wait.

A．alternative

B．difference

C．relation

D．opposition

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that we can’t get the necessary equipment , we will have to give up the experiment.

A．If

B．Supposed

C．Provide

D．Assuming

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_____professional development, big cities appeal to many young people ．

A．In favour of	B．In terms of
C．In need of	D．In honour of

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