Here are the answers for each question, with the word that has the underlined part pronounced differently from the others:

**I. PRONUNCIATION:**

1. **C. chore**
- Pronunciation: /tʃɔːr/ (differently from 'machine' /məˈʃiːn/, 'watch' /wɒtʃ/, and 'choose' /tʃuːz/)

2. **D. again**
- Pronunciation of the underlined part: /əˈɡeɪn/ (differently from 'guess' /ɡɛs/, 'big' /bɪɡ/, and 'sign' /saɪn/)

3. **D. physician**
- Pronunciation: /fɪˈzɪʃ.ən/ (differently from 'delicious' /dɪˈlɪʃ.əs/, 'special' /ˈspɛʃ.əl/, and 'musical' /ˈmjuː.zɪ.kəl/)

4. **B. forget**
- Pronunciation: /fərˈɡɛt/ (differently from 'morning' /ˈmɔː.nɪŋ/, 'pork' /pɔːrk/, and 'forty' /ˈfɔːr.ti/)

5. **B. cough**
- Pronunciation: /kɔf/ (differently from 'ghost' /ɡoʊst/, 'enough' /ɪˈnʌf/, and 'laugh' /læf/)

6. **A. heard**
- Pronunciation: /hɜrd/ (all others have the same pronunciation for 'ear' sound)

7. **D. sport**
- Pronunciation: /spɔrt/ (differently from 'salty' /ˈsɔːlti/, 'sauce' /sɔːs/, and 'sausage' /ˈsɔːsɪdʒ/)

8. **C. leisure**
- Pronunciation: /ˈleʒ.ər/ (differently from 'usually' /ˈjuː.ʒu.ə.li/, 'composer' /kəmˈpoʊ.zər/, and 'version' /ˈvɜːr.ʒən/)

9. **C. painter**
- The underlined part /eɪ/ differs from 'perform' /pəˈfɔːrm/, 'concert' /ˈkɒn.sɜrt/, and 'prefer' /prɪˈfɜːr/.

10. **C. measure**
- Pronunciation: /ˈmɛʒ.ər/ (differently from 'usually' /ˈjuː.ʒu.ə.li/, 'leisure' /ˈleʒ.ər/, and 'composer' /kəmˈpoʊ.zər/)

**B. STRESSED:**

1. **D. delicious**
- Stressed syllable differs from 'allergy' (1st), 'itchy' (1st), and 'fragile' (1st).

2. **D. tradition**
- Stressed syllable differs from 'volunteer' (3rd), 'musician' (2nd), and 'physician' (2nd).

3. **B. omelette**
- Stressed syllable differs from 'lemonade' (1st), 'turmeric' (1st), and 'spinach' (1st).

4. **D. composer**
- Stressed syllable (2nd) differs from 'pottery' (1st), 'attention' (2nd), and 'performance' (2nd).

5. **A. unique**
- Stressed syllable (2nd) differs from 'tuna' (1st), 'tofu' (1st), and 'recipe' (1st).

6. **D. calorie**
- Stressed syllable (1st) differs from 'stewing' (2nd), 'boneless' (1st), and 'donate' (2nd).

7. **C. opera**
- Stressed syllable differs from 'artistic' (2nd), 'music' (1st), and 'camera' (1st).

8. **C. exciting**
- Stressed syllable differs from 'training' (1st), 'paintings' (1st), and 'drawings' (1st).

9. **A. cello**
- Stressed syllable differs from 'piano' (2nd), 'saxophone' (1st), and 'painter' (1st).

Feel free to ask if you need further assistance!