根据下列各句句意及所给单词的首字母或汉语提示,写出该单词的正确形式。
1. Prices have risen by an ______(平均) of 4% over the past year.
2. It sounded like a ______(合理的)enough excuse to me.
3. It’s important to ______(区分) between business and pleasure.
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