Ключевые слова: background, black, blackboard, board, chalk, chalkboard, childhood, class, classroom, close, closeup, color, colored, concept, contemporary, copy, crayon, educating, education, educational, elementary, empty, exam, examination, green, indoor, inside, interior, knowledge, learn, lecture, lesson, object, pen, pencil, school, space, stationery, supplies, test, thing, up, utensil, white, write,