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: For some reason the makers of this item thought it would be wise to make each size ear piece fit a different bluetooth. The small fits my Jawbone, but does not fit my ear. The large fits my ear just fine, but does not fit my Jawbone. Save your money and find a different product.
Solution:
Negative