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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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Babies enjoy ______ before they go to sleep.

A．to pat

B．to be patted

C．patting

D．being patted

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–Mum, I have been admitted into Hong Kong University.
--Well done! ____________.

A．Take it easy	B．I’m not sure
C．I’m so proud of you	D．Wish you luck

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You ____ television. Why not do something more active?

A．always watch	B．are always watching
C．have always watched	D．have always been watching

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I couldn’t do my homework with all that noise .

A．going on

B．goes on

C．went on

D．to go on

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Your hand is dirty. It needs ____________.

A．to wash

B．to be washing

C．being washed

D．washing

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