题目

When you are feeling unhappy or forget how great you are, these are six ways to make you feel good about yourself. Look in the mirror and say to yourself, “I am a special person and there’s no one in the world like me. I can do anything!” It may not sound so good, but it really works! Do something nice for someone. Helping others always makes you feel good. Smile! Be friendly to people you meet. Look for the good things in your friends and family. Learn something new! Have you always wanted to decorate (装扮) your own room or learn how to swim? Go for it! New challenges are 计算： (1－2a)(1＋2a)(1＋4a2)(1＋16a4)．