Ключевые слова: apple, back, background, blank, bookmark, bookstore, business, classroom, college, colorful, colors, copy, courses, dark, desk, diploma, education, empty, fight, green, group, growth, homework, knot, knowledge, library, page, paperwork, people, practice, publication, race, research, science, shelf, skill, space, stack, student, study, studying, success, task, teamwork, textbook, training, university, wallpaper, white, wooden,