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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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He heard a loud noise, and it sounded __________ a train had been going under his house.

A．even if	B．as if
C．if only	D．only if

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—It's late. I have got to leave now. —OK. __________

A．Thank you	B．Don't worry
C．I'm sorry for it	D．Take care

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We should think carefully about _____ Mr Needham said at the meeting.

A．that	B．what
C．which	D．how

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These events are _____ to each other.

A．made	B．connected
C．linked	D．associated

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When you visit France, it is a _____ if you cannot speak French.

A．harm	B．fault
C．error	D．disadvantage

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