写出下列名词的复数形式。
1. tomato ___________ 2. French fry _________
3. strawberry_______ 4.apple _________
5. star______________ 6.family ____________
7. tooth______ 8.foot ________
9. potato _______ 10.bus_____
11. boy_______ 12.Chinese_______
13. brush_____ 14.dictionary_______
15. key________ 16.watch______
_17. class__________ 18.month______
19. comedy____________ 20.documentary_____
21. chess______ 22.piano______
23. address______ 24.wish_________
25. life_______ 26.half__
27. knife_____ 28.city______
29. photo_____ 30.party___
31. hobby_______