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When I try to understand _______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.

A．why it does

B．what it does

C．what it is

D．why it is

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A．too;wouldn’t	B．very;shouldn’t
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A．delighted	B．possible
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—No hurry.Leave it _____it is.It looks like rain.

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