Mark had been a hard-working student. But in high school he made friends with some bad guys and changed. Neither did he work hard, (也不) listened to his parents. Finally he (不及格) in one subject. Inside he sensed a strong (悲伤) but never talked to anyone.
One day, the headmaster met him by the fireplace. They (保持不变) silent for 10 minutes. Then the headmaster took out a burning piece of wood and put it in the soil. It kept (加热) for a while and then went out. The headmaster said (耐心地), "Son, staying out for some time didn't make it useless. Let me put it in the fireplace again." Of course, it started burning again.
The headmaster (继续), "Mark, you are just like that piece of wood. Earlier you were an excellent student. Then you fell into bad company. However, that wood found its (价值) again after being put back in the fire. In the same way, you can become one with great achievements."
Hearing that, Mark (后悔) what he had done and made up his mind to make his future. Two years later he was admitted to Princeton University and everyone was (骄傲的) of him.
