Ключевые слова: archive, back, background, black, blackboard, board, book, books, business, chalk, chalkboard, class, classroom, college, concept, copy, desk, dictionary, digital, education, elementary, equipment, green, knowledge, learn, learning, library, literature, nobody, notebook, open, page, paper, pencil, read, room, school, science, space, stack, student, study, studying, supplies, table, teacher, text, textbook, university,