Across
- 3. water + air + land
- 4. waste
- 7. a place where we go to read books
- 9. simple past of "understand"
- 12. simple past of "throw"
Down
- 1. noun of the verb "advise"
- 2. Adjective of "help"
- 5. opposite of "lazy"
- 6. organised
- 8. synonym of "fresh"
- 10. opposite of "clean"
- 11. synonym of "protect"