Ключевые слова: alone, background, bright, building, business, center, classroom, clean, clean interior, cleaner, commercial cleaning, corridor, entrance, exercise, floor, foreigner, hall, hallway, hallway interior, hard job, high school, house maid, housekeeper, indoor, inside, interior, janitor, janitorial services, job, labourer, life, lifestyle, light, maid cleaning, maid service, mopping, office, person, perspective, poor people, professional, room, school, school building, space, university, university classroom, walkway, window, worker,