Exercise 1. Write the nouns in the plural form. § 1.1.
A farmer, a country, a city, a day, a disc, a leaf, an address, a lemon, an
apple, a child, a man, a house, a mouse, a tooth, a photo, hair, a potato, a box,
a hobby, an exercise-book, a piano, a son-in-law, a wife, a gallery, a toy, a
roof, a foot, money