I don"t know _____ if she"s coming. [ ]A. at certain B. for certain C. with

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I don"t know _____ if she"s coming. [ ]
A. at certain
B. for certain
C. with certain
D. on certain

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举一反三

Dr Carl is an expert ______ the environment. [ ]
A. about
B. on
C. over
D. of

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Her husband joined her _____ her search _____ this unknown radiation. [ ]
A. in; in
B. in; for
C. in; of
D. for; for

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______ the money shortage, many small companies closed down. [ ]
A. As a result of
B. As a result from
C. Resulted in
D. As a result

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He spent very little time at school, perhaps a year ______.[ ]
A. at all
B. at least
C. in this way
D. in total

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The police charged him _____ robbery. [ ]
A. of
B. for
C. with
D. in

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