问题标题：
【帮我把下面几个单词变成复数cottoncigaretteflourherobeachradioglasselectricitybrushsheepmilkgoosefacilitydeernewsexercise-booknewspaperpolicemantoyson-in-lawknifewomanteacher】
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
womanteacher
贾培宏回答：
cottons
cigarettes
flours
heroes
beaches
radios
glasses
electricities
brushes
sheep
milk
geese
facilities
deer
news
exercise-books
newspapers
policemen
toys
sons-in-law
knives
womenteachers
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