根据下面的图画写一篇短文，叙述你在放学的路上发生的一件事。

要求：1．短文必须包括图中主要内容，可以适当发挥，但内容必须连贯，合乎逻辑。

2．词数：l00左右。

1、One day, I was walking home after school．On my way home, I saw a woman throwing something onto the ground．The ground looked so dirty at once．So I picked up the waste at once and threw it into the dustbin．Thinking that I had to find a way to stop such bad behavior, I brought out a piece of paper and wrote a notice which said,．"Please don't litter on the ground!" Then I hang the notice on the branch of a tree．Seeing the notice, the woman's face turned red．She said to me, "I'm sorry．You are a good boy．" After that I went away happily．