Good question and even it's a funny joke but don't forget that the teacher was a student one day, if a teacher teaches one subject it doesn't mean that he or she is not able to teach several subjects but we can say that a teacher can master subjects better than others every teacher choose to be specialized in single subject and these are the rules of teaching and thanks to teachers we learn, in primary school in many counties in the world only one teacher teaches all the subjects, sometimes it's the case in Bangladesh too. Students please stop saying stupid things and try to work hard and don't envy teachers maybe one day you will be a teacher

Train your mind to be calm in every situation.

Be sure to spend time with your parents while you still can, because one day when you look up from your busy life, they won't be there anymore!

Worship Allah and join none with Him in worship, and do good to parents, kinsfolk, orphans, the poor, the neighbour who is near of kin, the neighbour who is a stranger, the companion by your side, the wayfarer (you meet). Verily, Allah does not like those who are proud and boastful.

What makes some people more popular than other?

I also think he/she is very familiar with us but he/she is hiding up his/her real name

Allah placed man temporarily in this world to test him. He tests us with what we experience in life. He creates this life in order that believers may be distinguished from the non-believers, and by which they may be purified of evil, and worthy of the reward of Paradise. In other words, the world is merely a testing-ground where we can earn the good pleasure of Allah.

Be sure to spend time with your parents while you still can, because one day when you look up from your busy life, they won't be there anymore!

definitely we should pray for them

Pretty