单项选择题

"If we fail to act now, "said Tom, "We'll find ourselves ______ in action later on."

A．paid back
B．paid for
C．paid up
D．paid off
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单项选择题
The American professor came to realize that he had underestimated the ______ of most of the Chinese students.
A．magnitude
B．gradient
C．potential
D．firmness
单项选择题
______ he daydreamed, Peter saw figures in the sky.
A．Until
B．Since
C．While
D．During
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