Gave a lesson

A high school principal let me gave a lesson on their class. I am very happy to gain this chance,got ready by four days. I went to other school gave the same lesson. There are not good high school,I tried my work at two class,one is key class another is not. I written my teaching plan,written up every words,and remembered it. Two teachers gave me their main advice. I went to the school by coach,but something wrong happened. The class which I would gave the lesson is very bed class. Students are not good at study,they likes play. They were not made preparation,some times their answer was not about lesson,only joking. They were not reading aloud serious,but use a lazy tune-pattern ,their voice lacked expression. I asked for time-out and let they were tried again. Untill the lesson has come to closed,I felt the devil and all,but my student said their felt very good. They liked me,actively answered my question,if I am a true teacher ,they will not answer me a word. A student written me in his notebook,he said,"My practice teacher had a severe manner,but her talking is humour and friendly. " It is amazing!