Ключевые слова: background, banner, blackboard, board, book, card, celebration, chalk, chalkboard, class, classroom, college, concept, day, design, education, flat, girl, graphic, hand, happy, illustration, isolated, job, kindergarten, knowledge, learn, lesson, lettering, modern, people, poster, school, sign, smile, student, teach, teacher, teachers, text, thank, thank you, university, vintage, white, woman, world, you, young,