Here are the answers for the questions regarding pronunciation:

**I. Choose the word that has the underlined part pronounced differently from the others:**

1. **C. called** - the 'a' is pronounced /ɔː/ instead of /ʊ/ as in 'looked,' 'invited,' and 'wanted.'
2. **D. stopped** - the 'o' is pronounced /ɒ/ instead of /aɪ/ as in 'loved,' 'danced,' and 'asked.'
3. **D. visited** - the 'i' is pronounced /ɪ/ instead of /aɪ/ as in 'offered,' 'worked,' and 'lived.'
4. **B. learned** - the 'ea' is pronounced /ɜː/ instead of /eɪ/ as in 'played,' 'washed,' and 'talked.'
5. **D. brushed** - the 'u' is pronounced /ʌ/ instead of /aʊ/ as in 'gathered,' 'loved,' and 'helped.'

**II. Choose the word which has a different stress pattern from the others:**

1. **A. active** - stress is on the first syllable, while the others (harmful, healthy, obesity) have stress patterns on the second syllable.

Feel free to ask if you need further assistance!