完形填空
An old man walked slowly into a restaurant with his stick. His old jacket and worn-out shoes made him very different from others.1talked to him except a young waitress. Mary watched him move towards a seat by the window. She ran over to him and helped him2 . Then she put his stick against the table3 he could reach it. Without saying a word, he smiled and nodded a thank-you.
After the old man finished a good meal and paid the bill, Mary brought him the4 . After he put the money in his pocket, she handed him his stick and the old man walked to the front door5 with the help of the girl. Holding the door open for him, Mary said, "Come back and see us, sir!" The old man6 her with a smile and agreed.
When Mary went to clean his table, she was7 . Under the plate, she found a business card, 100- dollar bill and a8which read, "Dear Mary, I respect you very much, and you respect yourself, too. It is shown by the way you treat others. You have9 the secret of happiness."
In fact, the old man was the owner of the restaurant. That was the10 time that Mary or any of his workers had seen him.