Bythemiddleofthe21stcentury,th

By the middle of the 21st century, the vast majority of the world's population __________ in cities rather than in the country.

A．are living

B．will be living

C．have lived

D．will have lived

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We have a high regard for Mr. Black because he always tries to ________ his principles.

A．live up to

B．look forward to

C．catch up with

D．put up with

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T he problem of the present world is that those who are imaginative have little experience those who are experienced have weak imagination.

A．unless

B．although

C．because

D．while

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The most satisfying life is a life you know the things you’re interested in and pursue （追求）it for your own.

A．which

B．where

C．that

D．what

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Only lately about the dark secrets behind the seemingly-happy marriage of the golf star Tiger Woods.

A．the public have known	B．were the public known
C．have the public known	D．the public knew

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________this problem, they don’t know how to deal with it.

A．Face

B． Faced

C．Facing

D．To be faced

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