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It is not until recently ______ the scientists have found proof of there being water on Mars.

A．when

B．that

C．how

D．what

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15．– How cold it is! I wonder how grass survive under such heavy snow．
--Don’t worry．There is a lot of air in loose snow which _______．

A．keeps out the cold	B．keeps the cold away
C．keep off the cold	D．keep the cold up

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14．As we all know, it takes ten years to grow trees but a hundred to rear people, which means it will be ________ one becomes a useful person．

A．before long

B．long after

C．after long

D．long before

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13．Busy _______ she is, Rita ______ two hours every Sunday afternoon to spend with her son．

A．though, sets out	B．as, sets aside
C．as, sets down	D．though, sets off

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12．One of the best ways for people to keep fit is to ________ healthy eating habits．

A．grow

B．develop

C．increase

D．raise

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11．Christmas is ________ special holiday when ________ whole family are supposed to get together．

A．the ; the

B．a; a

C．the; a

D．a; the

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