写出下列名词的复数形式。 1. desk 2. eraser 3. friend 4. boy 5. box 6. class 7. watch 8. wish 9. leaf 10. family 11. wife 12. dictionary 13. man 14. woman 15. child 16. foot _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____ _____