Ключевые слова: apple, back, background, black, blackboard, blank, blue, board, book, books, chalkboard, class, classroom, clock, color, concept, copy, desk, education, elementary, empty, equipment, food, fruit, green, healthy, knowledge, lay, learning, nobody, notebooks, paints, pen, pencil, pens, red, school, space, stack, student, supplies, table, teaching, textbook, to, top, white, wooden,