Ключевые слова: back, background, banner, battered, black, blackboard, board, book, books, business, celebration, chalk, chalkboard, class, classroom, cognition, colored, communication, concept, conceptual, copy, day, design, desk, education, event, hardcover, homework, instruction, international, knowledge, learn, learning, lifestyle, literature, object, painted, pencil, pencils, place, reading, school, schooling, space, study, table, teach, text, wooden, writing,