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I have many friend.I feel very h____ when they have p___ So I often try my best to help them..根据首字母填空

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I have many friend.I feel very h____ when they have p___ So I often try my best to help them..
根据首字母填空
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I have many friend.I feel very happy when they have perplexity So I often try my best to help them.