单项选择题

Although they plant trees in this area every year, the tops of some hills are still

A．blank
B．hollow
C．vacant
D．bare
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单项选择题
Please be careful when you are drinking coffee in case you ________ the new carpet.
A．crash
B．pollute
C．spot
D．stain
单项选择题
The manager lost his _________ just because his secretary was ten minutes late.
A．mood
B．temper
C．mind
D．passion
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