Ключевые слова: accessory, background, board, chalk, chalkboard, chalks, clean, color, colorful, copy, dark, draw, education, element, elementary, empty, equipment, flat, green, group, highschool, lay, learn, learning, lesson, many, nobody, object, piece, pieces, school, set, simple, space, stick, study, studying, surface, teach, teaching, text, top, view,