单项选择题

John waited at the bus-stop for nearly half an hour ______ the bus finally arrived.

A．when
B．as
C．before
D．while
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单项选择题
Reading is an experience quite different from watching TV; there are pictures ______ in your mind instead of before your eyes.
A．to form
B．form
C．forming
D．having formed
单项选择题
The nurse treated the naughty boy very kindly, but her patience ______ at last.
A．went down
B．used up
C．got away
D．gave out
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