Ключевые слова: adult, announcement, background, black, blackboard, blank, blue, board, business, businessman, caucasian, chalk, chalkboard, classroom, coach, college, communication, concept, consulting, copy, drawing, education, employee, empty, formation, frame, free, hand, idea, learn, lesson, male, man, message, office, people, person, portrait, remember, school, space, staff, student, study, success, teach, teacher, text, wood, work,