Ключевые слова: background, business, change, communication, concept, contract, economy, educate, event, exchange, finance, financial, government, health, income, inflation, interest, internet, investment, knowledge, law, learn, legal, letter, management, message, money, plan, policy, profit, project, reform, rights, risk, school, security, service, sign, social, studying, success, tax, teach, text, time, training, wisdom, wooden, word, work,