单项选择题

(Sound waves) travel (in the air) in much (the same) way (like) water waves spread on the water.

A．Sound waves
B．in the air
C．the same
D．like
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If he (was to come) here this afternoon, I (should ask) him to go to the party (held by) student (union).
A．was to come
B．should ask
C．held by
D．union
单项选择题
It is (raining hard) outside. (Haven't) you (taken) an umbrella (with you)
A．raining hard
B．Haven't
C．taken
D．with you
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