单项选择题

We see lightning (before we) hear the thunder (because) sound travels (more slowly) than (light is).

A．before we
B．because
C．more slowly
D．light is
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单项选择题
I (would go to) visit that beautiful lake (but) I (couldn't) get (in touch) with you while I was in Boston.
A．would go to
B．but
C．couldn't
D．in touch
单项选择题
The only thing (what) really matters (to) the children (is) (how soon) they can return to their uncle's farm.
A．what
B．to
C．is
D．how soon
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