Ключевые слова: activity, art, artwork, book, book day, boy, cartoon, celebration, character, colorful, concept, creative, culture, cute, design, education, element, event, female, flat, flat design, girl, graphic, hobby, holiday, icon, illustration, information, international, knowledge, learn, leisure, library, literary, literature, male, novel, people, person, read, reading, science, story, study, woman, world, world book day,