单项选择题

Peter's father asked him to spend his time on something ______ researching into instead of playing all the time.

A. worthy
B. valuable
C. worth
D. precious
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单项选择题
When Sarah and I ______ on an article for the school newspaper, we found it difficult to work together.
A. compiled
B. gathered
C. collaborated
D. collected
单项选择题
During the summer vacation, Mary worked on a(an) ______ basis as a salesman, taking 8 percent of everything she sells.
A. salary
B. income
C. commission
D. pension
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