题目内容

By 2010, it is ____________ that computers will be able to perform at least 2 billionoperations per second.

A. adjust
B. projected
C. identified
D. organized

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They stood in the rain for two hours, but they ____________ for Mr. Ying, because hedidn't come at all.

A. needn't have waited
B. can't have waited
C. mustn't have waited
D. may not have waited

I advised_________ , but she turned a deaf ear to me.

A. her to swim not
B. her not swimming
C. her not to swim
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We can count ____________ his help whenever we are in trouble.

A. on
B. for
C. over
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We planned to cross the river at night but ____________.

A. reached
B. succeeded
C. tried
D. failed