The boy ___ composition won the first prize is the youngest in the group.
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He prefers to eat the rice ___ in the south.
A. who is grown
B. which is grown
C. when is grown
The knife ___ I cut the apple with can’t be found.
A. which
B. who
C. what
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
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