A.not talk B.enter C.enter in D.put E.follow ,F.We must not(

A.not talk B.enter C.enter in D.put E.follow ,F.We must not( ) 1.Don't go into the office.( ) 2.Don't talk loudly in the reading room.( ) 3.Students must keep qaiet when the teacher is speaking in class.( ) 4.Let's obey the school rules.( ) 5.Where must we leave our bicycles?