60.1 Множественное число:
1. flower - flowers
2. man - men
3. boat - boats
4. language - languages
5. watch - watches
6. country - countries
7. knife - knives
8. woman - women
9. address - addresses
10. sheep - sheep
11. tooth - teeth
12. leaf - leaves
13. child - children
14. foot - feet
15. umbrella - umbrellas
16. person - people
17. family - families
18. holiday - holidays
19. sandwich - sandwiches
20. city - cities
21. mouse - mice