Ключевые слова: advertising, answer, ask, asking, background, card, challenge, check, children, choice, closeup, color, competition, concept, design, education, exam, form, friends, fun, game, green, help, idea, information, intellectual, joy, lesson, mark, marker, message, nobody, object, option, paper, play, purple, query, question, questioning, quiz, researching, school, search, sheet, signs, symbol, teamwork, test, unknown,