单项选择题

A．differences
B．variables
C．alternatives
D．separations
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单项选择题
Some students at the university explain that they have no time to ______ athletic activities.
A．engage in
B．come up to
C．specialize in
D．take advantage of
单项选择题
Although the pay is not good, people usually find social work ______ in other ways.
A．grateful
B．payable
C．respectful
D．rewarding
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