根据短文意思，用方框中所给词语的适当形式填空，使文章通顺、完整(其中有两个多余选项)。

at，  hard，  change，  up，  before，  win，  happen， down，  choose，  practise，  come，  part

Life is not easy， so I’d like to say “When anything      ， believe in yourself!” When I was a young boy， I was too shy to speak to anyone. My classmates often laughed       me. I was sad but could do nothing. Later， something happened， and it       my life. It was an English speech contest(比赛). My mother asked me to take       in it. What a terrible idea! It meant I had to speak        all the teachers and students of my school!
“Come on， boy. Believe in yourself! You are sure to      .” Then mother and I talked about many different topics. At last I       the topic “Believe in yourself”. I tried my best to remember all the speech and      it over 100 times. With my mother’s great love， I did well in the contest. I could_____ believe my ears when the news came that I had won the first place. I heard the cheers from the teachers and students. Those classmates who once looked        on me， now all said congratulations to me.