单项选择题

The introduction of fabrics made from rayon, nylon and other ______ fibers has made many changes in our civilization.

A．manufactured
B．artificial
C．synthetic
D．manned
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单项选择题
After 10 hours at the wheel of the car, he began to feel the ______.
A．tension
B．nervous
C．exertion
D．strain
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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