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_____ is known to all is that effective measures should be taken to deal with the problem of the over-exploiting of our resources.

A．What

B．It

C．As

D．Which

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____, he sometimes makes mistakes.

A．Though he is careful teacher	B．As he is careful
C．A careful teacher as he is	D．Being a careful teacher

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—How did you know it?
　 —Well, the news ____ all over the town.

A．was spread

B．spread

C．was spreading

D．had been spread

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I lost my way in complete darkness and ,______ matters worse , it began to rain .

A．made

B．having made

C．making

D．to make

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The direction _______ which the president would go was kept secret ________ safety concern .

A．for ; over

B．from ; about

C．in ; for

D．at ; as

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You needn’t take your shoes off when you enter someone’s house in Australia , _____ , of course , they’re very dirty .

A．if

B．except

C．when

D．unless

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