写出下列单词的复数形式。 |
1. dog ___________________ 2. puppy ___________________ 3. lion ___________________ 4. baby ___________________ 5. cat ___________________ 6. piglet ___________________ 7. horse ___________________ 8. calf ___________________ 9. goose ___________________ 10. joey ___________________ 11. duckling ___________________ 12. hen ___________________ 13. mouse ___________________ 14. child ___________________ 15. knife ___________________ |