Here are the odd ones out for each row:

1. A. went (The rest are past tense of verbs related to drinking or smoking)
2. F. taxi (The rest are verbs related to movement)
3. B. motorbike (The rest are types of vehicles)
4. B. dried (The rest are past tense of verbs related to movement)
5. C. thinner (The rest are comparative forms of adjectives)
6. B. happier (The rest are comparative forms of adjectives)
7. D. latest (The rest are superlative forms of adjectives)
8. C. most expensive (The rest are superlative forms of adjectives)
9. F. trying (The rest are verbs related to movement)
10. E. speaking (The rest are verbs related to shopping)
11. F. head (The rest are verbs related to movement)
12. D. shoulders (The rest are parts of the face)
13. E. curly (The rest are adjectives related to size)
14. B. hair (The rest are adjectives related to size)
15. C. small (The rest are adjectives related to height)
16. C. personality (The rest are adjectives related to behavior)
17. D. horror film (The rest are types of films)
18. C. horrible (The rest are adjectives related to enjoyment)
19. E. film director (The rest are professions related to film)
20. F. actor (The rest are professions related to film)