Now China is fighting against illegal cooking oil（地沟油）, a kind of waste oil _____can cause a lot of illness.
#42592
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which
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whose
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who
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what
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A Wechat (微信) is an invention __________ can help people talk to friends, share photo, ideas and feelings freely.
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which
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who
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whose
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－Have you been to the Sunflower Garden _______ lies in Nansha? －Yes. The sunflowers there are very beautiful.
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where
B
which
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who
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when