One possible version:

Chairman Hu called on the whole society to build China into a saving country last year. As a student,

I think we should do something in answer to his call. We can't do something great but we may do

something closely connected with our life. At first, we'd better not waste money on too much junk

food such as ice cream, soft drinks or bread. It's unnecessary for us to pay much attention to dressing,

which will cost our parents' much money. We must learn to save electricity and water. Whenever we

leave our classrooms, we must turn off the lights and don't turn them on in the day time. It's a bad habit

to leave the water flowing all the time. Everyone should remember to turn off the taps after using water.

Although we have to buy some pens, pencils, notebooks and some other things for study, we mustn't

waste them. If everyone does a bit, we may help a lot in the project organized by Chairman Hu.

答案不唯一。