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

Let me give you an example: I've read this book with much expectation, it was very boring all through out the book
The answer to this example can be: Negative
Here is why: Review writer does not like the book because it was boring, therefore it is a negative review.

OK. solve this:
I was incredibly bored one day, and went snooping around the basement looking for a new book to read. When I found my mom's old tattered copy of Clan of the Cave Bears, I didn't expect much. Oh my goodness, though, Auel is a virtuoso. I cannot wait for the next one!
Answer:
Positive