One year, in the entrance examination of Madison middle school in Nevada, the United States, there was a question: Bill Gates's desk had five locked drawers, which were labeled wealth, interest, happiness, honor and success. Gates always took only one key and locked his four in the drawer. Which key did gates bring, Which drawer or drawers are the other four locked in?

    A Chinese student who had just immigrated to the United States happened to catch the exam. After reading the question, he panicked because he didn't know whether it was a Chinese problem or a math problem. After the exam, he asked the sponsor, a director of the school. The director told him that it was an intelligence test question, the content was not in the book, and there was no standard answer. Everyone could answer freely according to their own understanding, but the teacher had the right to give a score according to his point of view.

    The Chinese students got 5 points on the 9-point question. The teacher thought that if he didn't answer a word, at least it showed that he was honest. Based on this, he should give more than half of the score. What he couldn't understand was that his deskmate answered the question, but only got one point. The deskmate's answer is that Gates brought the key on the wealth drawer, and the other keys were locked in this drawer.

    Later, his American deskmate wrote to Bill Gates for answers. In his reply, Bill Gates wrote this sentence: the secret of your life is hidden in the things you are most interested in.