Obviously you should be stricter. The fact you are a substitute teacher doesn't change anything
You should just listen to your heart and understand what job is more appropriate for you
Maybe you should think about some interesting activities for them? It would be very useful to implement modern educational tools in your classes.
Is he upset of getting C? I don't think so. Maybe this case illustrates the disadvantages of our system of education. But as for a student I don't...
You should think about this carefully. Somebody has already said that it depends on the reason you e-mail. If you think your letter will help than...
1. Respect everybody around.
2. Study carefully.
3. Never ever give up