英语高手进Is this book very difficult?

英语高手进Is this book very difficult? this question is very difficult ( ) This book is very more difficult than the one I recommended 英语改错.He thinks this book is very interested. 一道英语改错题 急!改错This physics problem is very difficult. You must This book is very h___ to me. This book is very h___ to me This book is very hard________ children ______read. the subject is very well____in this book this book is very什么.(interest) This book is ___ to be too difficult to___ This book is difficult to understand.改为同义句