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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It is only when you nearly lose someone ______ fully conscious of how much you value him.
A．do you become
B．then you become
C．that you become
D．have you become
单项选择题
While driving along the treacherous road, ______.
A．my right rear tyre blew out
B．my right rear tyre had a blowout
C．I had a blownout on my right rear tyre
D．I had my right rear tyre blowout
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