写出下列名词的复数形式,
1.bus2.class3.dress4.piano5.family6.half7.sheep8.deer9.lity10.woman11.foot12.life13.watch14.radio15.match16.chinese17.child18.tomato19.box20.mouse21.day22.country23.leaf24twinbroyher25.womanteacher26.bananatree27.police28.shelf