this book is___that one,but___

this book is___that one,but___ I don't think this is___that a good student should do in our daily life.(something anything) This math problem is___that oneA .so easy as B.as difficult as C.much difficult than D.less easier This math problem is___that oneA .so easy as B.as difficult as C.much difficult than D.less easier than This box is___that one.A,heavy than B,so heavy than C,heavies as D,as heavy as选哪个,为什么? Whose book is this? what about this book? This is a book this book 复数 whose is this book? This book belongs to This book is yours Lily,is this book()? this is ( ) book. this book（ ）new This is s book.(a book提问) 英语翻译I________this book.=I________buying this book.=It________this book. this book is sold well 还是this book sells well