we must study hard. we musn't waste our time.we must follow the rules of the school. we mustn't break them.we must listen to the teacher carefully.we mustn't talk with each other at class....
imust contribute myself to study.i mustn't smoke in the classroom.i must listen to the teacher carefully.i mustn't talk with student in class.i must take part in the acit...
we must study hard. we musn't waste our time.we must follow the rules of the school. we mustn't break them.we must listen to the teacher carefully.we mustn't talk with each oth...
