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