单项选择题

It was felt that he lacked the ______ to pursue a difficult task to the very end.

A. petition
B. engagement
C. commitment
D. qualification
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单项选择题
The Japanese scientists have found that scents ______ efficiency and reduce stress among office workers.
A. enhance
B. amplify
C. foster
D. magnify
单项选择题
With prices ______ so much, it is difficult for the school to plan a budget.
A. vibrating
B. fluctuating
C. fluttering
D. swinging
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