Here are the answers for each section:

**I. Find the word which has a different sound in the part underlined:**
1. **A. flood** (the 'ou' sounds different compared to others)
2. **B. house** (the 'ou' sounds different compared to others)
3. **A. health** (the 'ea' sounds different compared to others)
4. **A. pavement** (the 'a' sounds different compared to 'travel' and 'footprint')
5. **B. shoot** (the 'oo' sounds different compared to 'smooth')

**II. Choose the word which has a different stress pattern from the others:**
6. **B. chimney** (stress pattern differs)
7. **C. population** (stress pattern differs)
8. **C. uncomfortable** (stress pattern differs)
9. **B. comfort** (stress pattern differs)
10. **D. hotel** (stress pattern differs)

**III. Find which word does not belong to the beach group:**
12. **A. cycle** (does not relate to beach activities)
13. **B. gasoline** (not typically associated with the beach)
14. **C. short** (does not fit with the beach theme)
15. **C. enjoyable** (is related to beach activities)

Feel free to ask if you need further explanations!