单项选择题

Please be careful when you are drinking coffee in ease you ______ the new carpet.

A．crash
B．pollute
C．spot
D．stain
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单项选择题
They claimed that the news came from a ______ source.
A．reliable
B．confident
C．believable
D．sure
单项选择题
Writing is a slow process, requiring ______ thought, time, and effort.
A．significant
B．considerable
C．enormous
D．numerous
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