I want to test the ability of students to read a passage and answer questions about it. Could you please come up with a good question for the passage "A teacher's professional duties may extend beyond formal teaching. Outside of the classroom teachers may accompany students on field trips, supervise study halls, help with the organization of school functions, and serve as supervisors for extracurricular activities. In some education systems, teachers may have responsibility for student discipline."? 

What do teachers supervise?