.
Нужно поставить во множественном числе.

1 lives, 2 knives, 3 shelves, 4 leaves, 5 loaves, 6 beliefs, 7 handkerchiefs, 8 wives, 9 housewives, 10 dwarfs, 11 safes, 12 roofs, 13 teeth, 14 cities, 15 lorries, 16 watches, 17 princesses, 18 women, 19 postmen, 19 dishes

1 lives

2 knives

3 shelves

4 leaves

5 loaves

6 beliefs

7 handkerchiefs

8 wives

9 housewives

10 dwarfs

11 safes

12 roofs

13 teeth

14 cities

15 lorries

16 watches

17 princesses

18 women

19 postmen

20 dishes