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
The accommodation was cheap, but the food was very ______.
A．high
B．costly
C．dear
D．overpaid
单项选择题
He doesn't seem to be able to ______ any interest in his studies.
A．make up
B．work up
C．turn up
D．use up
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