Here are the answers indicating the words with different stress patterns:

1. **A. promise** - Stress on the first syllable.
**B. pronounce** - Stress on the second syllable.
**C. maintain** - Stress on the second syllable.
**D. behave** - Stress on the second syllable.
**Answer: A. promise**

2. **A. festival** - Stress on the first syllable.
**B. suitable** - Stress on the first syllable.
**C. behaviour** - Stress on the second syllable.
**D. practical** - Stress on the first syllable.
**Answer: C. behaviour**

3. **A. pursue** - Stress on the second syllable.
**B. western** - Stress on the first syllable.
**C. lifestyle** - Stress on the first syllable.
**D. freedom** - Stress on the first syllable.
**Answer: A. pursue**

4. **A. opportunity** - Stress on the third syllable.
**B. popularity** - Stress on the third syllable.
**C. anniversary** - Stress on the fourth syllable.
**D. exhilarating** - Stress on the fourth syllable.
**Answer: C. anniversary**

In summary:
1. A. promise
2. C. behaviour
3. A. pursue
4. C. anniversary