Intimeofseriousaccidents，wekno

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In time of serious accidents，____we know some basic things about first aid，we can save lives.
A whether B. until C. if D unless

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________ your letter, I would have set off two days ago.

A．If I could have received

B．Should I receive

C．If I received

D．Had I received

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You ________ in person; a telephone would have been enough.

A．couldn't have come	B．needn't have come
C．shouldn't have come	D．mustn't have come

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I felt surprised that anyone of his intelligence ________ such an easy test.

A．might have failed	B．could have failed
C．should have failed	D．must have failed

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________ from the bright smile on his face, he ________ in passing the job interview.

A．Judging; must have succeeded

B．Judging; might succeed

C．Judged; must have succeeded

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—Please don't tell anybody.
—I ________. I promise.

A．can't	B．don't
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