—Look!Somebodytheblackboard．—W

—Look! Somebody ______the blackboard．
—Well, it wasn't me．I didn't do it．

A．is cleaning	B．was cleaning
C．had cleaned	D．has cleaned

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Du Vigneaud , a well-known American scientist, the Nobel Prize
chemistry in 1955.

A．accepted; for

B．received; on

C．won; for

D．gained; for

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By the time he the railway station ,the train .

A．reached ; left	B．reached ; had left
C．arrived ; had gone	D．got ; had been away

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—Where is Mr Smith?
—He in prison for more than two months.

A．has been

B．has been sent

C．has been thrown

D．has been put

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1. —Haven’t you heard the news?
—What news?
—Some of the workers are on march while others on strike.

A．the；the

B．the;/

C．/;the

D．/;/

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The visiting minister expressed his satisfaction with the talks, _________ that he
had enjoyed his stay here.

A．having added

B．to add

C．adding

D．added

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