单项选择题

Staff remaining in the lounge should notify their immediate supervisors before ______ to their work.

A. returning
B. returns
C. returned
D. to return
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Our research shows that the younger generation tends to spend more and ______ less than seniors.
A. saving
B. saved
C. save
D. to be saved
单项选择题
Since the most ______ candidate showed his potential, it was certain that he would be elected.
A. upcoming
B. probable
C. concerning
D. previous
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