Teacher lab explenation ways

1- Explain all the information in the class.

2- Explain in the class , then go to the lab to do it

3- Explain in the lab and tell the student to do it with you 

Teacher has to do

* IF any student escape from the class, she has to sent another student to the supervisor to tell her


* IF the teacher enter the class and find two students fighting, she has to stop them and tell the supervisor about them