16. loaf
loaves
20. tooth
teeth
7. series
series
11. sheep
sheep
8. offspring
offspring
13. person
people
24. mouse
mice
21. self
selves
14. foot
feet
18. woman
women
29. knife
knives
3. quiz
quizzes
17. wolf
wolves
10. cactus
cacti
23. ox
oxen
19. wife
wives
26. medium
media
33. child
children
22. scarf
scarves
12. fish
fish
32. elf
elves
30. half
halves
1. fish
fish
4. moose
moose
6. species
species
2. aircraft
aircraft
31. goose
geese
28. leaf
leaves
27. life
lives
5. salmon
salmon
25. man
men
15. appendix
appendices
9. deer
deer