Ключевые слова: academic, advertise, announcement, background, blackboard, blank, blue, board, break, chalk, chalkboard, child, class, classroom, clean, college, communication, copy, design, educate, education, empty, equipment, font, free, freedom, graphic, green, greenboard, holiday, holidays, information, kid, learn, leisure, lesson, many, message, nobody, object, out, piece, pupil, reminder, school, season, seasonal, sign, space, stick, sticks, student, study, studying, surface, table, teach, teaching, text, time, vacation, vintage, word, written,