Ключевые слова: advertising, announcement, backdrop, background, billboard, black, blackboard, board, break, chalk, chalkboard, childhood, children, class, classroom, draw, education, end, escape, fun, holiday, holidays, idea, learn, leisure, lesson, message, mid, relax, rest, school, season, student, study, summer, surface, teach, term, text, vacation, wallpaper, written, year,