Ключевые слова: 1, air balloon, background, beautiful, bouquet, boy, celebration, child, childhood, children, class, day, editorial, education, elementary, european, event, female, first, flower, grade, group, happiness, happy, holiday, kid, knowledge, knowledge day, learn, lesson, male, parent, people, pupil, school, schoolboy, schoolgirl, science, september, smile, student, study, studying, teacher, teaching, uniform, white, woman, women, young,