Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

[EX Q]: "Castle" is a wonderful book for children who have short attention spans. It provides adventure and re-affirms the laws of chivalry.
[EX A]: Positive

[EX Q]: This product arrived on time and in excellent condition. These boots have a good arch and seem sturdy. They do look a little cheaper than I anticipated. The tread is great. Size runs true.
[EX A]: Positive

[EX Q]: I took the Toefl test this morning and I have to say that this book was very useful. I haven't received the official grades yet but my note should be between 215 and 265, and given the fact that I've just studied two hours a day for one month...Definitely this book helped me a lot to improve my grammar, but I also believe that the examples were organized in a boring fashion. The practice tests for the listening section are really good, about the reading section... my advice to you: READ! READ! READ! No matter how much time you spend on vocabulary, they will find a word you don't know.
[EX A]:
Positive