Question

where should you wait before the teacher arrives?
in the library
inside the room
in line by lockers
at the cafeteria

Explanation:

This is a classroom etiquette question. The appropriate place to wait for a teacher before they arrive to start a class is outside the classroom in an organized line, and the option "In line by lockers" aligns with standard classroom procedures for waiting for a teacher, as other options are locations unrelated to waiting for the class teacher.

Answer:

In line by lockers