Given a review text from amazon and its polarity (either positive or negative). Generate answer "True" if given sentence and its polarity match, otherwise generate answer "False". A review is considered positive if the reviewer is satisfied with the product. Otherwise, it is considered negative.

Review: This book is one of the most comprehensive books on the 1911. If you want to know anything about the 1911, this book (along with Vol. 2) is the best source of information. 
 Polarity: Negative
False

Review: I agree, the CDs are a much needed help, since it would be impossible to pronnounce the Yoruba tones without the help of a native speaker. However, the design of the book is really poor and confusing. I have found several spealling mistakes in English and Yoruba. And the grammar explanations are very hard to understand.Unfortunately there are not many Teach Yourself Yoruba books that are worth it. This one at least provides basic vocabulary and pronounciation skills. 
 Polarity: Positive
False

Review: This unit is well built and works really well. It was just used to startup from a drained battery(left my Mac on battery all nite..duh). Well, at 0% charged, I plugged this unit in and starting web browsing, in minutes the charge was at 2% and rising, as well as keeping up with the browsing demands. For the price, it cannot be beat. It also seems I keep forgetting to unplug the original charger when I pack to do travelling, so this new unit makes a great spare to keep packed in my laptop case. 
 Polarity: Negative

False