单项选择题

The contract is ______ unless it is officially stamped.

A．invalid
B．invaluable
C．precious
D．deliberate
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单项选择题
The local people were joyfully surprised to find the prices of vegetables no longer ______ according to the weather.
A．evaluated
B．converted
C．fluctuated
D．modified
单项选择题
The president is often awakened by a noisy crowd which assembles on the White House.
A．concentrates
B．packs
C．squeezes
D．gathers
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