The book is borrowed from the library. You ________ your children put dots and lines here and there.

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A．shouldn't be letting

B．needn't have let

C．ought not to have let

D．mustn't have let

English is a language that people around the world ________ not speak perfectly but ________ at least understand.

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A．may; can

B．would; might

C．will; must

D．could; might

--________ I return the dictionary within three days?

--No, you ________. You ________ it for five days.

[　　]

A．May; needn't; can borrow

B．Can; mustn't; would have

C．Must; don't have to; can keep

D．Shall; can't; should read

The fire spread through the hotel very quickly but every one ________get out.

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It was very kind of you to do the washing-up, but you ________ it.

[　　]

A．mustn't have done

B．wouldn't have done

C．mightn't have done

D．didn't have to do

“No smoking”means you ________ smoke here.

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She left the reception early because she ________ get up early the next morning.

[　　]

There ________ every reason to believe that business will get better.

[　　]

________ would seem that there is no way out of our difficulty.

[　　]

________ doesn't seem to have been any difficulty over this question.

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