Astheywerewalkingaround,theyno

As they were walking around, they noticed a man _______ against a tree.

A．sit

B．to sit

C．sitting

D．Sat

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Because of Einstein’s Theory of Relativity, scientists never again regarded the world .

A．as before they did	B．as they regarded before
C．as they did before	D．as they had before

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--- Hurry up. The bus is coming.
--- Oh, no. We mustn’t cross the street the traffic lights are green.

A．until

B．since

C．while

D．after

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Sorry, you lost your purse; I hope it will some day.

A．turn out

B．show off

C．show up

D．turn up

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A brilliant idea occurred to him, to his research in the lab.

A．while devoting	B．while devoting himself
C．while he was devoted	D．while devoted

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Father doesn’t know Jack has been gambling; if he found out, I think he him out.

A．will drive

B．must drive

C．drove

D．would drive

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