单项选择题

Businessmen make most of their income from profit ______ by producing and selling products.

A．earning
B．is earned
C．earn
D．earned
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单项选择题
Hardly ______ when the lights went out.
A．the performance had begun
B．had the performance begun
C．the performance began
D．did the performance begin
单项选择题
With the population explosion, scientists will have to ______ new methods of increasing the world's food supply.
A．come up with
B．carry out
C．lead to
D．stick to
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