My wife and our two kids went with me to the post office a few weeks ago. （A）一位老人正站在我的前面.① He was also trying to pay his electricity bill. He was using a cane（手杖）and his hands and arms were shaking. （B）It seemed that he had a problemhe was 20 cents short of his total $118. 70. Twenty cents!
The lady behind the counter（柜台）had the old man in such a state， asking for just 20 cents.②But instead of letting the man go and paying the 20 cents herself, she told the man that(C)his bill wasn't paid in full, he would pay more next time for late fees. Hearing this really upset me, so I walked up and asked the lady behind the counter to give all of his money back to him. I handed her debit card（借记卡）and paid the bill for him.
The old man asked, "Why are you doing this?" as he was moved and began crying. I told him that it was the right thing to do.③He thanked me over and over. He smiled at my two kids on his way out of the post office.
The best part of all of this was that he walked out of the post office and straight to a supermarket， where he bought a large bag of snacks. As I was starting the engine（引擎）he walked up to our car and handed the bag to our two kids (D) the window.
