英语翻译
主动改被动：
who did you wait for a moment ago
who did he hear coming here
Mrs Smith always buys her son a big birthday cake on his birthday (两种）
who will do the work?
翻译：
1.在美国大部分的人把英语当做母语
Engilsh___ ____ ___ a first language ____ most people in the USA .Most people in the USA ____ Engilsh _____ a first language.