it is ______reading the book

It is not ( ) book. It is ( ) book. ( ) book is in the bag. the book ____(it )is very interesting what is it it is a book 对 ? 还是it is the book对? is.it.book.on.the.Chair.还是is.the.Book.On the chair对 The book is very interesting .It is good for ( )(we) this book is ------interesting than the other two.it is ---- The comic book is 3 yuan.It is very e_________ 填词.I ____ the book is interesting.It is boring. where is my book ? It is in the sofa. It is the book,which is mine .这是什么从句 Is it a book? What book is it?