Lily,is this book()?

< >book is mine,and< >are Lily's book's.A this,those B This, Lily is look __her book He is Lily's uncle 【改成否定句】 ls this her book [改为复数】 the is yo whose is this book? Is this your book? this book is mine. Whose book is this? This book is yours This book is difficult_you_read. This is a book Lily has already read this new book.(改为否定句) 用this is lily's skirt中的lily's提问