– Do you know why the river was polluted?

– Do you know why the river was polluted? - Do you know who was the first to swim _____ the river and Do you know why the train_____ _____?请问是填was late 还是 is late Do you know the r_____ why he was late for school? Do you know the r____ why he was late for school? this is _____the river was polluted 从句变分词：the water was from the river which had been polluted b Do you know ______around the earth?A why the mo Wastewater from factories polluted the river为什么用polluted The river was so polluted that it actually caught fire and b Do You Know Why 歌词 Do you know why the lady -------?（要完整回答）