Решение:
- a boy — 3 boys
- a bee — 7 bees
- a hen — 4 hens
- a bag — 5 bags
- a hat — 6 hats
- a pet — 9 pets
- a duck — 3 ducks
- a frog — 8 frogs
- a pig — 3 pigs
- a rose — 7 roses
- a rabbit — 2 rabbits
- a fox — 5 foxes
- a hare — 6 hares
- a snake — 4 snakes
- a bird — 9 birds
- a pupil — 10 pupils
- a flag — 8 flags
Ответ: boys, bees, hens, bags, hats, pets, ducks, frogs, pigs, roses, rabbits, foxes, hares, snakes, birds, pupils, flags.