帮我把下面几个单词变成复数
问题描述：
帮我把下面几个单词变成复数
cotton
cigarette
flour
hero
beach
radio
glass
electricity
brush
sheep
milk
goose
facility
deer
news
exercise-book
newspaper
policeman
toy
son-in-law
knife
woman teacher
答
cottons
cigarettes
flours
heroes
beaches
radios
glasses
electricities
brushes
sheep
milk
geese
facilities
deer
news
exercise-books
newspapers
policemen
toys
sons-in-law
knives
women teachers