Mr. Lewis is a dance teacher. He once taught in Paris and London. He is teaching in Washington now. He always stays in each city for two years and then moves to a new one. This time he has decided to move to New York. One day, one of his students said to him, “I'm sorry to hear that you are leaving. I believe the new teacher won't be as good as you are.” Mr. Lewis was happy when he heard this, but he said, “Oh, no. I'm sure he'll be as good as I am or even better.” The student said, “No. Before you came, five teachers taught us, and each new one was worse than the last.”