Ответ:

  1. a friend — friends
  2. a cat — cats
  3. a house — houses
  4. a box — boxes
  5. a fox — foxes
  6. a dress — dresses
  7. a sofa — sofas
  8. a potato — potatoes
  9. a tomato — tomatoes
  10. a bus — buses
  11. a day — days
  12. a city — cities
  13. a poppy — poppies
  14. a brush — brushes
  15. a cherry — cherries
  16. a boy — boys
  17. a match — matches
  18. a man — men
  19. a woman — women
  20. a child — children
  21. a mouse — mice
  22. a foot — feet
  23. a goose — geese
  24. a wish — wishes
  25. a lady — ladies