1.  Home town has changed a lot since my last visit three years ago.

2.  Our air garden has changed a lot.

3.  Thirdly, pollution all over the world changes a lot of fresh water into useless water.

4.  It seemed that the life haven't change a lot.

5.  In developing countries, life expectancy and infant mortality have changed a lot.

6.  In recent years, it has changed a lot especially in developing countries.

7.  In the developing countries, the life expectancy and the infant mortality has changed a lot since these 30 years.

8.  In developing countries, the life expectancy and infant mortaility had changed a lot during the past thirty years from 1960 to 1990.

9.  As for life expectancy, in 1960 it was forty years old.

10.  In developing countries, the life expectancy and infant mortality have changed a lot.