Ключевые слова: adult, adults only, blackboard, business, business person, businessman, chair, cheerful, classroom, confidence, copy space, corporate business, desk, education, expertise, front view, happiness, indoors, learning, lifestyles, looking, looking at camera, males, manager, mature adult, men, occupation, office, one man only, one person, portrait, professional occupation, professor, real people, school building, sitting, smiling, standing, student, studying, success, suit, table, teacher, teaching, wisdom, working, young adult,