Ключевые слова: advert, advertisement, advertising, announcement, background, billboard, black, black board, blackboard, blank, board, chalk, chalk board, chalkboard, class, classroom, close up, communication, concept, copy, copy space, copyspace, dirty, drawing, education, empty, frame, green, learning, message, note, old, primary, school, scratch, space, square, study, teaching, text, texture, used, white, wood, wooden, write,