题目内容

Wind power is an ancient source of energy __________ we may return in the near future.

A. on which
B. by which
C. to which
D. at which

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Not surprising that the process of choosing names __________widely from culture to culture.

A. varies
B. varying
C. differing
D. various

The case of two missing boys in this area is being_____.

A. looked up
B. looked into
C. looked for
D. looked after

It____ 5 years since we knew each other.

A. is
B. had been
C. will be
D. was

Don't come here tomorrow afternoon because we _____a meeting at three o’clock then.

A. will have
B. will be having
C. are having
D. will have had