Ключевые слова: 1, back, background, banner, blackboard, chalk, chalkboard, chalks, child, classroom, college, color, colorful, different, draw, education, exercise, flat, green, kid, knowledge, lay, learn, learning, lesson, long, many, object, pieces, pupil, scattered, school, september, student, study, studying, subject, teacher, top, university, view, write,