write a welcome address you will present as a class Captain to your school in respect of a class teacher newly posted to your class​

captain is the correct answer of what newly posted to your class

for this, you need to remember something significant in your own life, for example, if you were bullied when you were younger, you can mention your memories on this and touch on how such treatment can harm other kids your age either physically or mentally. (racism, car crashes, a parent in the hospital are all very good subjects, think hard on it! )

hope i ! : )