—Whydoyoulooksopuzzled?—Oh，Iov

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—Why do you look so puzzled?
—Oh，I ________ over a most difficult maths problem.

A．thought	B．have thought
C．am thinking	D．think

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—Have you handed in your schoolwork yet?
—Yes, I have. I guess it ______ now.

A．has graded

B．is graded

C．is being graded

D．is grading

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You can never imagine what great ________ we had _______ your school last time.

A．difficulty; finding

B．difficulty; to find

C．difficult; finding

D．difficult; found

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— _______
— I said you’d better go by bus.

A．Sorry, I don’t know.	B．I beg your pardon, sir?
C．What would you say?	D．Why not say again?

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I ______ for London tonight, for there is ______ an important meeting there.

A．am leaving; having	B．leave; to be
C．am going to leave; having	D．am leaving; to be

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----I _____this morning, but he could not come.
----Well, we’d better go and _____at his office.

A．called him; call on him	B．called on him; call him
C．called at him; call	D．called him; call at him

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