Sam’sbeendoinghishomeworksince

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Sam’s been doing his homework since 8: 00, ______ he?
A. isn’t B. doesn’t C. hasn’t

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I a new bike on my birthday，but I didn’t it．

A．received；receive	B．accepted：receive
C．received；accept	D．accepted；accept

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I didn’t find out the answer _______ the end of the story.

A．in

B．until

C．when

D．to

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—I swim here?
—I’m sorry．Children under 12 swim alone here．

A．Can；mustn’t	B．May；must
C．Must；can’t	D．Can’t；can

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Dr Ma loves his job and he the lifestyle of a flying doctor．

A．has used to	B．was used to
C．used to	D．has been used to

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This Math problem is too difficult. Can you show me_______, George?

A．what to work out	B．to work it out
C．how to work it out	D．how to work out it

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