单项选择题

He is ___________ about his chances of winning a gold medal in the Olympics next year.

A．optimistic
B．optional
C．outstanding
D．obvious
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单项选择题
Although many people view conflict as bad, conflict is sometimes useful ___________ it forces people to test the relative merits of their attitudes and behaviors.
A．by which
B．to which
C．in that
D．so that
单项选择题
Between 1974 and 1997, the number of overseas visitors expanded ___________ 27%.
A．by
B．for
C．to
D．in
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