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Scientists are convinced the positive effect of laughter_____physical and mental health.

A．of, at

B．by, in

C．of, on

D．on, at

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A．explanation

B．meaning

C．sense

D．idea

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　　　　---Not yet, I _______ it very carefully, but I haven’t decided.

A．will consider	B．have been considering
C．had considered	D．was considering

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　　　　----Is she missing? I told you to take care of her.

A．the; the

B．the; /

C．a; /

D．a; the

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　　　　--- Playing table tennis.

A．killing time	B．to kill time
C．spending the time	D．to spend the time

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　　　　--- Yes. It is in the reading material ____ we ____ reading yesterday.

A．that; did

B．that; were

C．when; were

D．when; did

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