根据句意和所给首字母提示，完成句中所缺的单词。

1. I opened the window to let in the f______ air.

2. He is an old teacher with twenty years' e            of teaching.

3. They can p            us with enough water and food.

4. Playing with a pet dog can bring us a lot of p           .  

5. Excuse me. I w______ if you can tell me where to park my car.

6. The moving love story of Liang Shanbo and Zhu Yingtai is an a______ Chinese legend.

马卡连柯说，“要尽量多地要求一个人，也要尽可能尊重一个人”。这句话说明的德育原则是________。