Here are the words with different pronunciations:

1. **A. forgets** - pronounced /fərˈɡɛts/; **B. happens** - pronounced /ˈhæpənz/
2. **A. neighbour** - pronounced /ˈneɪbər/; **B. favourite** - pronounced /ˈfeɪvərɪt/
3. **A. studied** - pronounced /ˈstʌdid/; **B. waited** - pronounced /ˈweɪtɪd/

For the first set, all have a similar ending sound except **A. forgets**.
For the second set, **A. neighbour** is different because of the "ou" sound compared to **B. favourite**.
For the third set, all words have similar endings except **C. culture**, which has a different ending sound.

Make sure to choose words based on their unique pronunciations thus the answers are:
1. **A** (forgets)
2. **A** (neighbour)
3. **C** (culture)