写出下列单词相应的复数形式，并标出s的发音。
1、hand [ ] 2、street [ ] 3、watch [ ] 4、wife [ ]
5、leaf [ ] 6、glass [ ] 7、knife [ ] 8、brush [ ]
9、boy [ ] 10、toy [ ] 11、family [ ] 12、photo [ ]
13、potato [ ] 14、party [ ] 15、hobby [ ] 16、man
17、woman 18、child 19、mouse 20、foot 21、sheep 22、fish
1、hands [dz] 2、streets [ts] 3、watches [iz] 4、wives [vz] 5、leaves [vz]
6、glasses [iz] 7、knives [vz] 8、brushes [iz] 9、boys [z] 10、toys [z]
11、families [iz] 12、photos [z] 13、potatoes [z] 14、parties [iz] 15、hobbies [iz]
16、men 17、women 18、children 19、mice 20、feet
21、sheep 22、fish