Ifyousitinachairalongtime,your

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If you sit in a chair _____a long time, your back may begin to hurt.

A．at

B．in

C．on

D．for

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—Must I water the flowers now? —No, you ________ . You __________ do it later.

A．mustn’t, must	B．mustn’t, may
C．needn’t, may	D．needn’t, must

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We’ll play basketball ________ Class 3 tomorrow.

A．over	B．against
C．to	D．for

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Do you know _________ an “o” and _________ “u” in the word “computer”?

A．there is, an	B．is there, an
C．there is, a	D．is there, a

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The Yangzhi River is one of __________ in the world.

A．the longest rivers	B．the longest river
C．longer rivers	D．longer river

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—How can we protect ourselves ________ the earthquake? —We should stay calm first.

A．with	B．about
C．for	D．from

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