Given the task definition, example input & output, solve the new input case.
Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
Example: I've read this book with much expectation, it was very boring all through out the book
Output: Negative
Review writer does not like the book because it was boring, therefore it is a negative review.

New input case for you: I bought this book after i failed to get the score i needed in the TOEFL exam, and it helped me a lot at the second time I did the test. The best part about it is the CD-ROM that has 4 complete tests so you can practice just like if you were doing the real Computer Based TOEFL Test. It helps you to get in the mood of the test so you are prepared when you take the real test. There is only one thing that should be enhanced in this book. The review and hints at the "writing test part" are not enough. There should be more essay examples. Over all, this is the book you have to buy if you are planning to pay just for one book to prepare for the TOEFL
Output:
Positive