－Do you know _______ World Water Day is?－On March 22nd.
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---You’ve chatted for nearly two hours. --- Yeah. We’re talking about the things ______ happened yesterday.
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Do you know Nelson Mandela, _______ was the first black president of South Africa.
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Tony, tell me the result of the discussion ______ you had with your dad yesterday.
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---There are many volunteers ______ are helping the children in Sichuan.--- And most of them are college students.
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