Проставьте существительные во множественное число, an ox, a Knife, a watch, an address, a child, a foot, a potato, a sheep, a foot, factory, a toy, a deer

an ox - oxen

a knife - knives

a watch - watches

an address addresses

a child - children

a foot - feet

a potato - potatoes

a sheep - sheep

a foot - feet

a factory - factories

a toy - toys

a deer - deer