these aren't your invitation cards.they are ____(they)

Are these cards?NO,they aren't cards These aren't your cards. They are ( )(they).用所给词的正确形式填空. 适当形式填空：These aren't your cards .They are[ ](t These aren't your cards.They are theirs.为什么填theirs,不是动宾吗(⊙_⊙ These are your books,aren’t they?怎么回答 Are these your ______ trousers?No,they aren't ______. Are these your books?yes,they are.\No,they aren't they're he These are your book's ,aren't they和Those aren't your pens,ar Are these your rulers?No,they aren't.They are no Are these your books?No,they aren't.____________are over the Are these your bikes,Lucy and Lily?——No,they aren't( ).I thi these aren't your books.they are (o )books.根据所给首字母填空