【正确答案】Dear Annie,
   I have a problem, and I need your help. I always thought I was popular at school, and I have lots of friends. But I just found out that my friend held a birthday party a few days ago, and he didn't invite me. Most classmates in my class were invited except me, and I don't know why. I'm very upset and don't know what to do. What do you think? Can you help me?