单项选择题

______ most of the earth's surface is covered by water, fresh water is very rare and precious.

A．As
B．Once
C．If
D．Although
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单项选择题
So heavy ______ that we were prevented from going out.
A．the rain was
B．is the rain
C．was the rain
D．would the rain be
单项选择题
This kind of cloth ______ well and ______ long.
A．is washed…lasts
B．washes…lasts
C．washes…is lasted
D．is washed…lasted
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