The knife ___ I cut the apple with can’t be found.
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The room in ___ there are many books is mine.
A. that
B. who
C. which
This is the pen ____ he bought yesterday.
A. which
B. who
C. when
All _____ is needed is a supply of oil.
A. which
B. that
C. what
Finally, the thief handed everything ____ he had stolen to the police.
A. which
B. what
C. that
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