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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One of the workers (has) (hung) the curtains that (had) been (laying) on the floor.
A．has
B．hung
C．had
D．laying
单项选择题
(Lost in thought), she (didn't hear) the thunder (to begin) in the mountains (far off).
A．Lost in thought
B．didn't hear
C．to begin
D．far off
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