Twentyfivepercentofthewaterint

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Twenty-five percent of the water in this river _____ dirty in the past.
A. is B are C. was D. were

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A．Neither was it

B．Neither it was

C．So was it

D．So it was

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A．frustrated

B．frustrating

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Don’t put off today’s work for tomorrow. I mean , today’s work _____today.

A．may do

B．must do

C．may be done

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—He used to be quiet, didn’t he?
—_________ And he still enjoys keeping quiet!

A．No, he didn’t.

B．Yes, he did

C．Never.

D．I am not sure.

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There is a “ No smoking “ sign here. You _________ smoke.

A．can

B．may

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