单项选择题

Nobody is perfect, and everyone acts thoughtlessly _______ .

A. on occasion
B. on every occasion
C. on occasions
D. in occasion
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The wildflowers will be ______ after this rain.
A. incredible
B. boring
C. creative
D. original
单项选择题
In her spare time she does ____ work.
A. volunteer
B. voluntary
C. voluntarily
D. volunteering
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