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: I bought three copies of this book as funny Christmas presents, and they were a big hit. One of the people I gave it to, just after opening it, began to read several small sections aloud to the rest of us, and it was very entertaining.
Solution:
Positive