Hundreds of species are declared to be extinct（A级）in the coming century．
A. die away
B. leave off
C. die out
D. 1eave out
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Scientists ignored lake Vida because they thought that a lake of ice__________．
The Substance can be added to gasoline to accelerate（B级）the speed of automobiles．
A. quicken
B. shorten
C. 1ooen
D. enlarg
The first time the author played the violin in the street．he expected
A. he would became a great musician．
B. he would get into trouble．
C. people would be happy t0 give him money．
D. people would stop and listen．
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