He is very grateful to the girl____ he often turns for help when he meets with difficulties.
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whom
B
to whom
C
to who
D
which
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That is a beautiful kingdom _________ three mountains join together and steep mountains reached to the sky.
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which
B
whose
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that
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American women usually consider their best friends as someone ________ they can turn when in trouble.
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to which
B
on whom
C
to whom
D
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Encouraged by my science teacher, I set about my studies on developing my product, _____I hope I will succeed in applying for a patent（专利）.
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with whom
B
to whom
C
through which
D
for which