题目内容

Biologists are predicting that they ____ able to alter genes and control heredity.

A. have been
B. will be
C. would like to be
D. had been

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She wondered if she could have the opportunity to spend ____ here so that she could learn more about the city.

A. sometimes
B. some time
C. sometime
D. some tomes

Without these achievements, the opening of the west ____

A. couldn't occur
B. needn't have occurred
C. couldn't have occurred
D. can't occur

You don't need to consult with anybody else. Actually the best person ____ is your mother.

A. to talk to
B. to talk
C. talking about
D. whom you talk

____ any area receives more water than the ground can absorb, the excess water flows to the lowest level, carrying loose material.

A. Being
B. Whenever
C. When might
D. Is