One morning I met my father outside the school gate. Prior to this, I received my teacher's permission to be temporarily excused from class. I would collect some items from my father.
My father handed me my examination result slip which he had signed. Also, he gave me a consent form for the Track and Field Training Camp in which I would take part. My father scolded me for being irresponsible. I just kept silent and told him that I had to return to my class. My father then quickly left for work.
I rushed back to my class. However, I did not carefully place my wallet, which contained money, in my pocket. I dropped it and I didn't notice it. The money was the fee for the Track and Field Training Camp!
The writer's father was angry because ...