Yearsagowedidn’tknowthis,butre

Years ago we didn’t know this, but recent science _______ that people who don’t sleep well soon get ill.

A．showed

B．has shown

C．will show

D．is showing

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The teacher demanded that the homework ________in the way we’d just learned.

A．is done

B．has been done

C．be done

D．was done

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In order to improve English, __________.

A．it is necessary to need a lot of practice.

B．a lot of practice is needed.

C．you need a lot of practice

D．it needs a lot of practice.

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----Then, I’m afraid there is _______ left.

A．nothing

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C．none

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A．is to be blamed

B．to blame

C．should blame

D．to be blamed

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----Yes. _______books are stolen.

A．few

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C．Some

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