Please take any seat ___ is free.
A. which
B. that
C. in which
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That is the very book ___ I was looking for.
A. who
B. that
C. which
After the fire in his house, the old car is the only thing ___ he owns.
A. who
B. that
C. which
The speaker spoke of some writers and some books ___ were popular then.
A. who
B. that
C. which
Who is the worker ___ took some pictures of the factory.
A. who
B. that
C. which
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