18、One possible version

Nowadays, some of us students have formed some bad habits on campus. For example, some students leave the lights on in the daytime, or let water running after washing. Some leave over much food on the table after eating. Besides, waste paper can be seen everywhere.

It is well know that these bad habits will have a bad influence on our character and behavior. What’s worse, they can not only increase our cost at school and add financial burden to our parents, but also waste the limited resources.

So to build a resources-saving campus it is high time that we had to deal with the problems. In my opinion, we should start with ourselves to save everything. I'd like to remind my classmates to take the lead in reducing the waste. We must form some good habits. For example, when we brush our teeth and wash hands, never leave water running unnecessarily and when we leave classrooms, we should make sure that the lights have been turned off.

二、选择题