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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单项选择题
Mr. and Mrs. Smith are so excited today, for they bought ______ yesterday.
A. many furnitures
B. so much furniture
C. ninny piece of furniture
D. a lot of furniture
单项选择题
Though steam engines have now passed the ______ of their usefulness, their heritage remains.
A. prime
B. era
C. epoch
D. dafe
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