![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
Please write the plural form of the words 1.hero ____ 2.city ____ 3.roof ____ 4.zoo ____ 5.child ____ 6. country ___ 7.tooth ____ 8.mouse ____ 9.boy ____ 10.foot ____ 11.map ____ 12.bag ____ 13.bus ____ 14.tomato ____ 15.baby ____ 16.goose ____ 17.wolf ____ 18.leaf ____ 19.potato ____ 20.watch ____