单项选择题

As an excellent shooter, Peter practiced aiming at both ______ targets and moving targets.

A. stationary
B. standing
C. stable
D. still
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单项选择题
China started its space industry only in recent years, and should ______ no time in catching up.
A. delay
B. lag
C. lessen
D. lose
单项选择题
It seems oil ______ from this pipe for some time. We'll have to take the machine apart to put it right.
A. had leaked
B. is leaking
C. leaked
D. has been leaking
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