____ a jewel falls into the mud, it remains as precious as before.
A. While
B. If
C. For
D. Whether
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The school _____ I visited last year was not the one _____ I once worked.
A. which; where
B. which; which
C. where; which
D. where; where
Do you know the girl _____ wearing a red dress?
A. whose
B. who
C. whom
D. who's
You may borrow any book _____.
A. that you interest
B. which you are interested
C. that interests you
D. which interests you
The reason _____ I'm writing to you is to tell you about a party on Saturday.
A. because
B. why
C. for
D. which
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