Write down the correct form of the plural: story, box, monkey, dress, toothbrush, man, mouse, orange, sandwich, camera, strawberry, class, inch, foot, goose, berry, roof, cliff, potato, day, sheep, wife, match, horse, fox, bush, bus, watch, city, crocodile, wolf, child, party, boy, gum, desk, book, woman, apple, star, trolley, toe, cow, house, photo, pen, glass, car, baby, thief, potato, toy, key, ox, kiss, life, lady, calf, knife, tooth, deer.