B.pass on
C.take off
D.describe
B.pass on
C.take off
D.describe
B.lose confidence
C.avoid dangers
D.waste time
B.wrote
C.created
D.proved
B.reduce the effect of
C.a mat placed beneath the carpet of a sofa
D.a rug placed on the floor
B.the temperature of the air
C.humid air
D.the process in which water vapor changes to liquid water when the air is cold enough
B.sing the song
C.sound the alarm
D.give beautiful sound
B.think about the topic
C.read some related material
D.discuss the topic with others
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