Ключевые слова: back, background, book, books, bookstore, business, campus, certificate, club, college, colorful, cover, covers, degree, dictionary, education, element, graduate, graduation, green, group, homework, icon, knowledge, law, learn, legal, leisure, library, literature, novel, old, open, page, paper, pile, publication, read, school, science, stack, study, tale, teacher, text, textbook, training, university, volume,