Sentences from lessons in the three subjects

It is possible to say

Sit down quietly!

The noise you are making is annoying. Is there another way to speak without making a disturbance?

Stop interrupting!

When the teacher speaks, what must you do?

Stop running and sit down in your place!

After the lesson begins, what do pupils need to do?

I want all of you to listen.

When the teacher speaks, what must you do?