Ключевые слова: advert, advertisement, advertising, background, billboard, black, blackboard, blank, board, chalk, chalkboard, class, classroom, close, closeup, communication, concept, copy, copyspace, desk, drawing, education, empty, female, frame, handwriting, learn, learning, lesson, message, note, old, school, sign, space, student, study, symbol, teacher, teaching, text, texture, up, used, white, wood, wooden, write,