题目内容：

下面短文中有5处语言错误.请在有错误的地方增加、删除或修改某个单词.

The most unforgettable experience for me is the speech competition holding last year. I devoted me to the preparation. But I was such nervous when I stood on the stage that I forgot everything. Not until I caught a sight of my teacher did I calm down. Finally, I did a good job. When I heard I got the first prize, my heart was filled in joy and tears rolled down. Through this speech competition, I understand that it is confidence which makes people successful.