A good way to pass an exam is to work hard every day in a year. You may fail in an exam if you are lazy for most of the year and then work hard only a few days before the exam. If you want to be good at English, you have to read stories in English, and to speak English as much as possible. A few days before the exam you should go to bed early. Do not go to bed late at night. Before you start answering in the exam, read carefully over the question papers, and try to understand the meaning of each question. When you have finished your exam, read over your answers. Correct the mistakes and be sure that you don't miss anything out.

①社会的进步和发展，需要人们都有所创造奉献  ②从事科学研究，人的生命才有价值

③生命的价值在于奉献和创造                                  ④奉献的人很辛苦，得不偿失