1. We often take our safety for garanted/sure
2.He was struck/beaten by how friendly the tribe was
3.She spotted/witnessed first hand how the tribe lived
4.Please offer/help yourself the whatever you need
5.The tribe likes to show/indicate hospitality by sharing a meal with visitors

2. the cheapest  3. modern  4. new  5. noisier  6. quieter  7. large  8. the biggest  9. far  10. best