单项选择题

Peter's father asked him to spend his time on something ______ researching into instead of playing all the time.

A. worthy
B. valuable
C. worth
D. previous
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单项选择题
What he said just now had little to do with the question ______ discussion.
A. with
B. under
C. by
D. over
单项选择题
It is often more difficult ______ than to get financial support for scientific research.
A. obtaining trained men
B. to find trained men
C. in getting men trained
D. recruiting experienced men
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