Ключевые слова: amazing, angle, announcement, astonish, background, black, blackboard, board, bulletin, business, chalk, chalkboard, class, classroom, communication, concept, confusion, detail, drawing, education, exclamation, exclamation mark, frame, ideas, insignia, mark, matter, message, notation, notice, notification, pattern, placard, plank, problem, proclamation, publicity, punctuation, school, science, shock, sigh, sign, surprise, symbol, teaching, texture, view, white, write,