Question

you will be class suspended (from the next lab), your parents or guardian contacted and you will have to write an essay about fire safety. i can leave my lab station to visit a friend... only when the teacher says it is okay. when my group is done at any time!

Explanation:

In a lab setting, safety and following teacher - instructions are crucial. Leaving the lab station without permission can pose risks and disrupt the lab environment. Teachers need to know the whereabouts of students for safety and management reasons. So, students should only leave to visit a friend when the teacher approves.

Answer:

... only when the teacher says it is okay.