单项选择题

You have to be very quick, ______ you'll miss the last train.

A．but
B．or
C．and
D．so
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单项选择题
The number of the tourists to these small villages ______ growing.
A．to keep
B．keeping
C．keep
D．keeps
单项选择题
The longer I worked with Mr. Smith, the more I realized ______ in computer technology.
A．how skillful he was
B．how he was skillful
C．how was he skillful
D．how skillful was he
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