来自梁文军的问题
保护环境十分重要---theenvironmentisveryimportant（三个空）it'syourturn-ourrooma.cleanb.cleanupc.cleanoutd.tocleanIsawhim-basketballatthattimea.playb.playingc.playedd.plays
保护环境十分重要
---theenvironmentisveryimportant
（三个空）
it'syourturn-ourroom
a.cleanb.cleanupc.cleanoutd.toclean
Isawhim-basketballatthattime
a.playb.playingc.playedd.plays
