Peoplehaveplantedagreatmanytre

People have planted a great many trees in order to________ wind and sand in the desert.

A．hold down

B．hold up

C．hold back

D．hold out

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They must have finished the work by the end of last month, ______?

A．mustn’t they

B．haven’t they

C．hadn’t they

D．didn’t they

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－I didn’t know you were good friends.
－You ______. I have known her since she moved here. You were studying abroad then.

A．may have

B．needn’t have

C．couldn’t have

D．must have

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.－Is there any flight to Tokyo today?
－I think there ______, for the weather is too bad.

A．mustn’t

B．mightn’t be

C．needn’t be

D．can’t be

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Research findings show we spend about two hours dreaming every night, no matter what we ______ during the day.

A．should have done	B．would have done
C．may have done	D．must have done

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－I went to work on foot yesterday, though it ______ cats and dogs.
－You ______ by bus. It was likely to get a cold.

A．is raining; must have gone	B．rained; would go
C．was raining; should have gone	D．have rained; could have gone

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