单项选择题

There ought to be less anxiety over the perceived risk of mountain climbing than______in the public mind today.

A. exists
B. exist
C. exiting
D. to exist
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单项选择题
We met the young couple at a party three weeks ago.______we've had no further communication.
A. Thereof
B. Thereby
C. Thereafter
D. Thereabouts
单项选择题
Professor John McMorran's retirement ______ from next semester.
A. takes effect
B. brings effect
C. puts into effect
D. carries into effect
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