1. We learn to be good ______ . (学生)
2. We should ______ (保持) the water ______ (干净).
3. We shouldn't make the water ______ (脏的).
4. We should ______(使用) things made of ______(纸).
5. People are ______(尽力) protect them .
6. Deer can run very ______(快).
7. I learned a lot from our ______(课本).
8. I learned a lot from TV programmes , ______(收音机) and newspapers .