1) children, men, women, feet, cheese, geese; - *Cheese*
2) classes, boxes, buses, puppies, princesses, dishes; - *Dishes*
3) babies, ladies, families, tomatoes, stories; - *Stories*
4) fish, salmon, deer, ships, sheep; - *Salmon*
5) balls, dolls, elephants, glasses, pencils, pens. - All words form plural regularly. There is no extra word.