单项选择题

His father had promised to buy him a computer ______ he behaved himself.

A．in case
B．while
C．after
D．provided
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单项选择题
Fortunately, the bank clerk ______ press the alarm button before the robbers got away.
A．could
B．succeeded in
C．was able to
D．managed
单项选择题
At each end of the tube ______ , one which gathers light and one which magnifies the image.
A．are two lenses there
B．two lenses are
C．are two lenses
D．two lenses are there
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