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

Having (finished) his term paper (before the deadline), (it was delivered) to the profes-sor (before) the class.（）

A. finished
B. before the deadline
C. it was delivered
D. before

单项选择题

(Although) the danger that he might (be injured), Smith (bravely entered) the burning house (in order) to save the boy.（）

A. Although
B. be injured
C. bravely entered
D. in order

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