单项选择题

______ there is little we can do to modify the weather, we can at least know what kind of weather to expect.

A．Since
B．When
C．While
D．Unless
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单项选择题
It was requested that all of the equipment ______ in the agreed time.
A．erected
B．would be erected
C．be erected
D．will be erected
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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