Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A critically important book that is a must-have for teachers

For years Harry Wong has been at the forefront on the lecture circuit, and his books and tapes have sold in the millions. Teachers everywhere have learned myriad positive strategies from his lifelong experiences as a teacher. Now, the book he and Rosemary Tripi Wong wrote together has been revised, and is better than ever. Its high sales ranking is ample evidence that this is a critically important book for teachers. If you teach, you simply must obtain and read this book.