Sure! Here are the most suitable words or phrases to complete the sentences in Exercise 11 and Exercise 12:

### Exercise 11:
1. **touching** (the exciting/touching speech of the groom...)
2. **amazing** (the amazing/terrible public speaking experience...)
3. **eco-tour** (meaningful eco-tour...)
4. **exhausted** (I was blank/exhausted...)
5. **argue** (we learned to argue/agree...)
6. **thrilling** (the first time was a thrilling/awful experience...)
7. **team building** (company organizes team building/individual activities...)
8. **fight** (taught us to fight/run away from the bullies...)
9. **memorable** (was an embarrassing/memorable event...)
10. **technical** (essential soft/technical skills...)

### Exercise 12:
1. **going** (How’s the summer going?)
2. **sites** (a lot of time exploring different sites...)
3. **species** (different species and learning about...)
4. **flora** (what were you most impressed with, flora?)
5. **definitely** (Definitely the flora and fauna...)
6. **traditional** (workshops on traditional crafts...)
7. **community** (a great way to understand the community...)
8. **amazing** (Have you been in any amazing activities?)
9. **experience** (traditional experience...)
10. **immersion** (immersion sounds great...)

Feel free to ask if you need further clarification!