not until we watched the earth day programme that we know about global warming
only we living with nature in harmony can save the earth
only after the meeting that i knew that air pollution causes about three millions death yearly
never will i forget the day that i make a very important speech on the earth day summit
not only to talk about problem,the earth day summit is also a place for us to find solution
not only after she saw the dirty river herself before she believes in what he said
not only important in improving ourselves,better education also improve our society
never did realise that water is so precious