Ключевые слова: advertising, answer, ask, asking, background, card, challenge, check, children, color, colorful, competition, concept, design, different, education, exam, flat, friends, fun, game, help, idea, information, intellectual, joy, lay, lesson, many, mark, marks, message, nobody, notebook, object, paper, play, question, questioning, quiz, school, search, sheet, signs, symbol, teamwork, test, top, view, yellow,