单项选择题

We have no time to lose. Let's ______ on the task before us.

A．enter
B．impose
C．concentrate
D．overwork
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单项选择题
Successful leaders ______ events rather than react to them.
A．conquer
B．dominate
C．determine
D．contest
单项选择题
One expert (remarks) that a computer with (so) many tubes as the brain (has) neurons (would require) the Empire State Building to contain it.
A. remarks
B. so
C. has
D. would require
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