Great changes have taken piace in people's life in past 20 years.
　　In the past , people kept in touch with relatives or friends mainly bu sending letters . They would listen to the radio for news and other programmes on TV.
　　Some families are rich enough to send their chilren to school in their own cars.More and more peoplelive in big and bright aprtments with several rooms.
　　In a word ,people live better than before .