Tothosescientists,itstillremai

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To those scientists, it still remains to be a question ______ man can go back to the old days with time machine.

A．if

B．that

C．how

D．whether

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Mary never does any reading in the evening, __________.

A．so does John	B．John does too
C．John doesn't too	D．nor does John

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Maybe you have been to many countries, but nowhere else __________ such a beautiful place.

A．can you find	B．you could find
C．you can find	D．could you find

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I failed in the final examination last term and only then __________ the importance of study.

A．I realized	B．I had realized
C．had I realized	D．did I realize

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Only when your identity has been checked __________.

A．you are allowed in	B．you will be allowed in
C．will you allow in	D．will you be allowed in

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The old couple have been married for 40 years and never once __________ with each other.

A．they had quarreled	B．they have quarreled
C．have they quarreled	D．had they quarreled

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