单项选择题

The teacher said that the heavy object () at the same speed as the light one.

A.fall
B.fell
C.falls
D.is falling

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As () known to all, language has been developed through social contacts.

A.is
B.are
C.though
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The heavy rain () for several days and all the roads were flooded.

A.went up
B.kept on
C.fell down
D.broke down
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