Ключевые слова: absence, academic, address, auditorium, background, blackboard, blue, chairs, chalkboard, classroom, college, communication, conference, copy space, desks, education, educational, empty, equipment, facility, floors, furniture, hall, institution, instruction, interior, learning, lectern, lecture, microphone, nobody, oration, platform, podium, presentation, public, room, school, seminar, silence, speaking, speech, stand, study, teaching, university, venue, walls, wooden,