--- ________ great fun chatting online is！---But it may cause you a lot of trouble.
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What a
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What
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How a
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_________ it is! Thank you very much!
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What valuable advice
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What a valuable advice
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How good a suggestion
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How good advice
—__________ hard work you have done!— It’s very kind of you to say so.
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What
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How
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What a
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How a