阅读下面材料，在空白处填入适当的内容（ 1个单词）或括号内单词的正确形式。
All through high school, I       (play) football, basketball, and soccer, and I was on the track team. But from that day on, boxing was the sport that I liked        (much), because it’s more        (challenge)and exciting to me. I found that I enjoyed the thrill of the one-on-one competition. I also liked the fact that it was up to me      I won or lost—that I was thedetermining factor. I think I’ve always been a competitor, and winning would give me      (satisfy) and a good feeling about myself. I wanted to win—every time.
I started training with the man who got me into the ring that first time. With him          (act) as my boxing coach, friend, mentor, and a father figure for me          (look) up to, I learned that boxing is a sweet science       I could use my brain as well as my strength and size. I used my ability to focus under pressure.        (train) by him for several years, I went from being a street fighter        a gold medal-winning Olympic champion.