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Our class discussed the question of __________it is necessary for us students to use mobile phones on campus.
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if
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where
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that
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A stubborn boy like him dosen’t learn from his mistakes______ he was punished badly.
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I was on the point of going to bed ________ Mr. Zhang rang.
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She will fly to Washington, ________ she can enjoy herself.
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We’ll have a picnic in the park this Sunday _____ it rains or it’s very cold.
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 Several weeks had gone by _______ I knew the painting was missing.    
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