Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.
One example: I've read this book with much expectation, it was very boring all through out the book
Solution is here: Negative
Explanation: Review writer does not like the book because it was boring, therefore it is a negative review.

Now, solve this: Like most of the other reviews here I bought the Batcave for my four year old and it was a disaster. I paid around 39 for it and see it's now retailing for 9. It just doesn't work. It's a pathetic toy. However I got in touch with Mattel and on the second attempt (they didn't respond first time or didn't get my e-mail) they phoned to offer me a choice of replacement toys. Hope everyone here has done this or will do it - complaining is the only way toy manufacturers will learn.
Solution:
Negative