单项选择题

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

A．before we hear
B．because
C．more slowly
D．light is
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单项选择题
(Only then)(he became) aware of (the fact) that there were more difficulties ahead (than) he had expected.
A．Only then
B．he became
C．the fact
D．than
单项选择题
(Had) they had enough cash (on) hand, they (would buy) this fancy (furniture).
A．Had
B．on
C．would buy
D．furniture
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