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One day, our English teacher Mr Smith came into the classroom with a book in his hand. He started his lesson with a question, “Who can d1. what stress is like?” No one answered. Then he raised the book and asked, “How heavy is the book?” We b2. to think and guess. One student stood up and said, “I think it is 100 grams.” Another student said, “It is 200 grams.” Our answers were d3.. At last, Mr Smith explained, “The real weight doesn’t m4.. It depends on how long you hold it. If I hold it for a minute, it is OK. If I hold it for an hour, I will have a pain in my right arm. If I hold it for a d5., I will have to ask you to send me a doctor. It is the exact same weight, but the longer I hold it, the h6. it becomes. This book stands for stress. If you hold it without p7. it down, sooner or later, you will not be a8. to hold on. No matter how much stress you have, stop and take a rest if possible. Boys and girls, you should learn to relax y9.. I am sure you will live a happy school life.” We will n10. forget Mr Smith and this meaningful lesson.