The book is well worth reading 为什么不能用very代替well

The book is well worth reading 为什么不能用very代替well The book( )I spent 30 yuan is well worth reading .the book is written by Jk Rwling .It is well worth reading. It is __ reading this book carefully. A.worth B.well worth C l think the book,is worth reading 为什么是reading The book is well worth what I paid for it . be well worth doing 中为什么不能用good it is (well/very) worth doing 填哪一个 为什么 the book is .A very worth reading B very worth being read C I think it is a very interesting book ____ is well worth rea The book is worth reading 翻译 these books is well worth reading 句中的well是充当行容次修饰worth?