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How many more decades will have to pass __ scientists succeed in providing a cure for

A. whenB. before C. since D. until

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According to passage, why is bottled water so popular？

A. It is much cheaper than wine.
B. It is considered healthier.
C. It appeals to more cultivated people.
D. It is more widely promoted in the market.

Workers newly arrive from the southor rural areas perform. their job
A B
differently from those from other sections of the city.
C D

A. Curious B. Interesting C. Strange D. Wonderful

The college sports meet was ____ till next week because of the heavy rain.
A put out
B put on
C put off
D out up