Образуйте множественное число следующих существительных.
1) radio, lesson, court, thief, potato, house, eye, fish, tooth-brush, rose, story, truth, key, mouse
2) child, path, hero, day, book-case, oak, manner, louse, study, goose, wolf, yard, brush, sofa
3) man, horse, idea, kilo, tooth, brother, cousin, glass, daisy, ox, swine, grass, lion, writing-table
4) son-in-law, youth, piano, half, dream, foot, deer, child, material, mouse, servant, potato, cow-boy
5) woman, hoof, branch, mosquito, ox, frog, mouth, hill, root, photo, foot, country, joint, noun