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