Ключевые слова: appreciation, art, back, background, banner, black, blackboard, blue, board, book, card, celebrate, chalk, chalkboard, class, classroom, concept, day, design, drawing, education, gift, green, greeting, happy, holiday, illustration, international, knowledge, learn, lesson, lettering, message, national, pencil, poster, present, school, science, student, study, table, teacher, text, university, white, wooden, world,