answer: Myra was criticised by the teacher for cheating on exams and talked back rudely.
documents: #Person1#: Why did the teacher criticise Myra in front of the whole class? 
  #Person2#: Because Myra was cheating on exams, and she spoke back rudely. 
  #Person1#: I don't think that Myra should have spoken so rudely to the teacher. I know she was angry, but that's still no excuse for rudeness.