We should look after them/animals.
In the past, the houses were very old and the streets were narrow. But now there are a lot of new tall buildings.
the sky is blue and the air is fresh. In the past, people had no entertainment, but now people can listen to the radio
or watch TV after supper. They can get information through the Internet. As for transport, people used to go to
work on foot or by bicycle. But now they can go somewhere by car or by bus. I am glad to see these changes.
The streets are very wide. In the past, the pollution was heavy. The rivers were dirty and full of rubbish. But now
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