Cross the odd one out

1. • drums,
   • monkey,
   • tiger,
   • duck
2. • hot dog,
   • pizza,
   • doctor,
   • biscuit
3. • dance,
   • run,
   • swim,
   • purple
4. • eyes,
   • teeth,
   • penguin,
   • mouth
5. • fireman,
   • teacher,
   • violin,
   • policeman