Do you know Nelson Mandela, _______ was the first black president of South Africa.
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The farmer was very thankful to the doctor _________ saved his son．
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— Who is your favorite writer?— Mo Yan. I like writers _________ tell stories well.
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Now China is fighting against illegal cooking oil（地沟油）, a kind of waste oil _____can cause a lot of illness.
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—Have you found the information about Bill Gates________ you can use for the report? —Not yet. I’ll search some on the Internet.
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