英语，短语翻译！

1.it is unhealthy for you to go to school without eating.

2.it is necessary for your health to take a walk.

walking plays a necessary role in your healthy life.

3.you should have enough water every day.

4.going to bed early and getting up early can help you keep energy.

5.smoking may lead to cancer.

6.no littering

you nustn't Forbid litter.

7.We must put the rubbish into the dustbin.