阅读下面语言材料，然后按要求作题。

　　About a year ago, I went to stay at a Detroit hotel．I didn't want to carry too much money with me, so I asked the desk clerk to put a hundred-dollar bill in the safe for me．

　　The next morning, however, the clerk said he knew nothing about my money．I didn't have any proof(证据)that I had given the man the money．There was nothing I could do but go to the nearest lawyer．

　　The lawyer advised me to return to the hotel with him and give another hundred-dollar bill to the clerk．This I did．An hour later, I went back to the desk and asked for my money．Because I had the lawyer as an eyewitness to the second hundred-dollar bill, the clerk could not say he knew nothing about it．

　　Another hour later, I put the second part of the lawyer's plan into action．This time both the lawyer and I went to the hotel．I asked for the hundred-dollar bill once again, and when the clerk insisted he had already given it to me, I denied(否认)it．The lawyer said to him, “I saw this gentleman give you a hundred dollars．If you don't return it immediately, I'll be forced to call the police．”

　　The clerk realized he had been tricked, so he gave me back the first hundred-dollar bill．

　　“I don't know how to thank you enough for getting my money back,” I said to the lawyer．And what you suppose he answered?

　　He said, “Oh, don't thank me．That will be a hundred dollars, please．”