l am doing M_ exercise,and I want a computer

l am doing M_ exercise,and I want a computer i am interested in m_.I want to be a doctor in the future.(补 I am doing neither exercise nor homework . I am a computer. I want to be a computer manager. ( ).I am studying computer I want to exercise and s----- healhy I take a lot of exercise and am very fit 中的am为什么是对的? I am doing morning exercise.哪里错了? 翻译：I am a computer. AM A BOY AND I WANT A GOOD ENGLISH NAME 英语翻译I am a professor of sports and exercise so I often deal I want to(am)(a)(computer expert ) 对括号里有错误的一项改正