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----Look at the boy running on the playground. Is it David?
---- It ______ be him. I saw him go to the teachers’ office just now.

A．mustn’t	B．can’t
C．may not	D．needn’t

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You can’t go back home______you finish your homework.

A．if

B．until

C．so

D．because

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— Why not join us in the game, Joe?
—________, but I have to finish reading the book first.

A． Yes, please

B．Let’s go

C．Not at all

D．I’d love to

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—Look，the light in Jim’s room is still on. Do you know______?
—To study for the coming exam, maybe.

A．if he works hard	B．why is he so busy
C．why he stays up so late	D．when he will stop working

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—Mr. Gao, I don’t understand the meaning of this new word.
—You can __________ the word in your dictionary. I believe you can understand it well.

A．look at

B．look for

C．look up

D．look after

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—Well, you've come back! ________ did you stay in Shanghai?
— For about seven days. I really enjoyed myself.

A．How many

B．How far

C．How long

D．How often

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