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
______ he daydreamed, Peter saw figures in the sky.
A．Until
B．Since
C．While
D．During
单项选择题
Clothing made of plastic fibres has certain advantages over ______ made of natural fibres like cotton, wool, or silk.
A．one
B．the one
C．that
D．what
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