1 not until did we watch the earth day programme on tv,we known much about global warming .
2.only can we save the erath by learning to live in harmony with nature.
3.only after the meeting did i know that air pollution causes almost three million deaths every year .
4. never will i forget the day when i made a very important speech on the earth day summit.
5 not only the earth summit is a place to talk about problems,but also a place to find solutions for the future.
6. not until did she go there and see the dirty river herself , julia believed that he said.
7 not only the better education is important for improving ourselves but also for developing our society.
8 never did i realise that water is so precious