Ключевые слова: ad, analyzing, audit, background, book, business, chek, circle, classroom, club, courses, detail, diary, discovery, document, edition, education, empty, glass, imagination, inspection, knowledge, lens, library, literature, looking for, magnification, magnifying, notebook, open, optical, page, paper, paperwork, practice, progress, research, school, science, search, skill, stack, stacking, strategy, studying, subjects, survey, surveying, teamwork, text, textbook, web,