根据首字母提示填入合适的单词使短文通顺、完整，每空一词。

    Thirty years ago，I was a s .I went to school by bike. There was no s in our city. Our school was small，but it gave me a lot of fun. At that time，I liked sports very much. I often played f on the playground. And I liked r b ，too. I wanted to be a d  . Now everything is different. What a big change!