单项选择题

We went to travel with some friends of ______.

A．ourselves
B．ours
C．us
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单项选择题
I have worked on the problem, so I am feeling tired and ______.
A．sleeping
B．asleep
C．sleepy
单项选择题
______ are for ______ cutting things.
A．Knives, used
B．Knives, using
C．Knife, used
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