School officials cut the ribbon on the new wing of classrooms at the Millburn High School Monday night. Construction on the three-floor expansion—which includes general classrooms, science laboratories and art rooms—is complete, but classes won't take place in the wing until the fall. Advance Placement testing could take place in the wing this spring. The expanded cafeteria will be available to students next week. The project at the high school cost $7.6 million. School officials cut the ribbon on the Millburn Middle School expansion earlier on Monday.