He ____just______(do) it

He ____just______(do) it He tries _____(do)it again he think do i can it Can Tom do it?Ask he改错 what did he do with it what did he do with it? he had better do it now. He ________ can do it well.Believe him (he) .himself He promised he would not do it any more Then he asked his father ____he could do it as he do. 应该填什么? i don't think he can do it well at three years old,but he do what did he do with it,和what did he do 有什么区别呢?