Plurals and singular nouns :)

12345678910111213
Across
  1. 4. Day
  2. 6. Leaf
  3. 7. Knife
  4. 10. puppy
  5. 12. Hospital
  6. 13. Class
Down
  1. 1. Burger
  2. 2. Volcano
  3. 3. Tomato
  4. 4. Dress
  5. 5. Sheep
  6. 8. Fish
  7. 9. baby
  8. 11. Bat