Bài 1: Change these words into plural form
1. city_______
2. Rose _______
3. Dish _______
4. dress _______
5. Watch _______
6. Fox _______
7. Witch _______
8. Boy _______
9. Cherry _______
10. Butterfly _______
11. Bus _______
12. Day _______
13. Knife _______
14. box _______
15. Leaf _______
16. Hero _______
17. Piano _______
18. Person _______
19. Tooth _______
20. Policeman _______
21. Child _______
22. Ox _______
23. Deer _______
24. Craft _______
25. Roof _______