Thereasonforhissuccessishework

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The reason for his success is ______ he worked very hard.

A．why

B．that

C．whether

D．how

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—I would like to speak to Mr. Martin.
—There’s nobody here by that name.
—Sorry, I ______ the wrong number.

A．should have dialed	B．must dial
C．could have dialed	D．must have dialed

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Long skirts have been ______ for a long time in the West, but they are coming back this year.

A．out of order	B．out of fashion
C．out of control	D．out of place

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—Will you please make yourself ______ to us, please?
—I’m the honorary chairman of the committee.

A．know

B．to know

C．knowing

D．known

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When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.

A．it

B．this

C．that

D．which

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Environmental experts point out that ______ some serious problems such as global warming, but it also could threaten human life.

A．not only does increasing pollution cause

B．not only causes increasing pollution

C．not only increasing pollution causes

D．not only increasing pollution does cause

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