Doyouknowhowlongthedinosaurson

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Do you know how long the dinosaurs _____ on the earth before their extinction?

A．had existed	B．had been existed
C．have existed	D．have been existed

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A big crowd gathered _____ him ______.

A．to hear; speak	B．hearing; speaking
C．to hear; speaking	D．hearing; to speak

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______ is known to us all, China has its own English language newspaper.

A．It	B．Which
C．That	D．As

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It is difficult for any of us to eat better, exercise more, and sleep enough, ________we know
we should.

A．because	B．even if
C．unless	D．before

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The computer is ________ to be one of the greatest inventions of the 20th century.

A．considered	B．regarded
C．expected	D．suggested

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--We________ in advance. Look, this restaurant is almost empty.
--Yes, just in case.

A．needn’t have booked	B．mustn’t have booked
C．didn’t need to book	D．couldn’t have booked

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