单项选择题

We can see from this article that ______.

A．breathing in smoke might be harmful
B．rope ladders should not be used
C．youngsters often start most home fires
D．jumping out of a window during a fire is dangerous

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单项选择题

But for the rain, we ______ a pleased journey.

A．will have
B．should have had
C．would have
D．must have had

单项选择题

This article hints that windows are ______.

A．easily broken
B．good escape routes
C．often hard to open
D．useful to shout off smoke