单项选择题

Belgium replied that she had always been faithful to her international ______.

A．obligations
B．duties
C．responsibilities
D．liabilities
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单项选择题
Over the last fifteen years, running has become a popular ______ for 30 million participants of all ages.
A．fantasy
B．pastime
C．symposium
D．penalty
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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