用must和mustn`t个造4句话2月19之前就要

You must do it. You must finish you homework. Something must be done to stop pollution. You must go to school. You mustn't copy other's homework. You mustn't go to net bar. Trash mustn't be thrown about here.

must1.You must get up early.2.You must listen to the teacher carefully.3.You must work hard.4.You must do your homework.5.You must get to school on time.mustn'tYou mustn't get up late.You mustn't talk...