These mice were eating some cheese( 改单数句)

these toothbrushes are new.改单数句 are these your erasers?改单数句 These are my horses改单数句 these are sone arms.改单数句 These mice have small teeth.(改成单数形式) these are some arms(改成单数句） These are some old photos.改为单数句 There were some old diaries.(改成单数句） They like these rulers（改单数句） she nedds broccoli（改复数句） 将句子:They have some balls.改单数句. They are some good dictionaries.改为单数句怎么改 There are some animals in the zoo改单数句