It was the end-of-year party. I had asked my mother to make us cookies. Mom's chocolate chips were the best.
But two o'clock passed, and there was no sign of her. Most of the other mothers had come and gone, dropping off their cakes and chips. The party went on, but I wouldn't leave the window. The three o’clock bell soon took me away from my thoughts（思绪）. I took my bag and walked out for home.
The house was empty when I arrived. My heart was filled with anger(气愤). For the first time in my life, my mother had let me down. I was lying on my bed when I heard her coming. “Robbie,” she called out. “Where are you?” She was looking for me from room to room, but I kept silent.
When she came into my room, I didn't move, “I'm so sorry,” she said. “I got busy and forgot.” She began to laugh. I couldn't believe it. I turned over and found that she wasn't laughing but crying. “I'm so sorry. I let my boy down.” she cried like a little girl. I had never seen my mother cry.
“It's OK, Mom,” I said, “We didn't need those cookies. There was plenty of food to eat. Don't cry. It's all right.” We held each other in a long hug(拥抱).
、硒、氟应理解为
