单项选择题

When you cross the street, you can never be ______ careful.

A．much
B．very
C．too
D．so
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单项选择题
I'll write a letter to ______ people are on the list.
A．any
B．all
C．whoever
D．whichever
单项选择题
Soon after he reached Australia, Captain Cook ______ to draw the map of the .east coast.
A．set about
B．set off
C．set sail
D．set out
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