单项选择题

The ball ______ two or three times before rolling down the slope.

A．swayed
B．bounced
C．hopped
D．darted
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单项选择题
The president made a ______ speech at the opening ceremony of the sports meeting, which encouraged the sportsmen greatly.
A．vigorous
B．tedious
C．flat
D．harsh
单项选择题
You d better let me know as soon as there is a(n) ______ position in the branch office.
A．vacuum
B．empty
C．hollow
D．vacant
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