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
It is often more difficult than to get financial support for scientific research.
A．obtaining trained men
B．to find trained men
C．in getting men trained
D．recruiting experienced men
单项选择题
The harder the shrub is to grow, _________.
A．the higher price it is
B．the higher price it would have
C．the higher the price is
D．the higher is the price
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