阅读下面短文，从每小题A、B、C三个选项中，选出可以填入空白处的最佳选项，并将其字母标号填入题前的括号内。
I was recently invited to dinner by a friend. During the meal, the manager came over and said that our meal was free. He stood there 1 at me, he seemed to know me. 2 I asked if he knew me. He laughed and said I had probably 3 him, but I had changed his life. He said that twelve years ago he was in 4 stress management class. I asked the group what their number one stress was and 5 of them, including him, said it was their 6.
He said I listened carefully and then took a chair and placed it in the center of the room. I 7 on the chair for a few minutes and then I invited everyone to do the same. I wanted them to look at the room from 8 there. After everyone had done it, I asked the group to think about how 9 the room looked when they changed their perspective(角度).
Then I asked them to 10 their bosses. Was this the same person who had seen their good 11 and hired（雇佣） them? Do they remember how happy they were to be 12 for the job? How did these wonderful people become terrible bosses?
He said I looked at him and asked if he had 13 said thank you to his boss for the opportunity to make a living. He answered no.
He told me his 14 changed that night. He went back to work with a 15 card to his boss. He had been the manager for 8 years. He said he owed（把……归功于） it all to me: I had taught him to look at life from different perspectives and I had taught him to express gratitude（感激之情）.
