单项选择题

Once a _______ is formed it is very difficult to shake it off.

A．habit
B．custom
C．practice
D．usage
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单项选择题
Have you flown very much As a matter of fact, this trip is _______.
A．my first
B．the first to me
C．the first one of mine
D．my one to be the first
单项选择题
Though he views himself as a realist, Michael says that his findings make him very _______ about future.
A．optimistic
B．objective
C．precautious
D．sympathetic
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