Ключевые слова: achievement, advertisement, agreement, approval, assurance, award, bubble, ceremony, certificate, cheerful, choice, client, colleague, confetti, confidence, contract, control, data, education, effort, evaluation, excellent, expertise, giving, graduation, guarantee, improvement, internet, learning, management, message, occupation, online, page, pass, performance, quality, quality control, research, review, satisfaction, send, service, sign, standard, student, success, teacher, university, verification,