When my grandparents were young, they lived a hard life. They didn't have enough food to eat
or comfortable houses to live in. It was not easy to travel around because they had to walk or ride
a bike. But at that time, the air was fresh and they could swim and catch fish in the clean river. At
present, people's life is much better. They have all kinds of food to eat and have moved into flats
in tall buildings. They can travel around by car, by bus, by train or by air. But the environment is
not as clean as before.
