Ключевые слова: back, backgrounds, blackboard, book, books, bookshelf, cactus, classroom, closeup, collection, color, cover, creativity, desk, education, expertise, eyeglasses, glasses, green, hardcover, heap, imagination, indoors, intelligence, learning, library, literature, material, nature, old, oldfashioned, paper, reading, research, school, science, space, stack, student, studying, table, teaching, technology, textbook, top, wisdom, wood, yellow,