用适当的人称代词或物主代词填空
Henry:I can't find ___book.Can___help___you?
Colin:Sorry,___can't.I am looking for ___knife.
Henry:There is a red knife over there.Is ___your knife?
Colin:No.___is Nancy's ___knife is red.
Henry:Colin,I'm late for school.Help ____
Colin:Ok.Let ___help___
Henry:Thank___very much.