If I don't change my money back, I'll have more money to buy books. But I decided to return the money, and I knew that if I didn't tell the cashier about the mistake on the bill, he would be blamed and fined by his boss.<br><br>He looked at me gratefully and apologized to me for his mistake. He said that if it hadn't been for me, he would have been fined. The relieved smile on his face made me laugh. I realized at this time, the original help others is so happy!
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