—MayIsmokehere?—Ifyou，chooseas

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—May I smoke here?
—If you ________， choose a seat in the smoking section.

A．should	B．could
C．must	D．may

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Last night, our men’s national football team was defeated by 0: 5, which ______ us very much.

A．excites	B．satisfies
C．upsets	D．pleases

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It’s his own ______ that he failed in yesterday’s interview.

A．fault	B．mistake
C．duty	D．error

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----- What do you think of my paper?
----- The _______ part is well written but the latter is just so-so.

A．primary	B．former
C．late	D．latter

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I _______ use a clock to wake me up because at six o’clock every morning the train comes by my house.

A．couldn’t	B．mustn’t
C．shouldn’t	D．needn’t

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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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