Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great company to purchase all your test books.

I have been buying text books from Amazon for the past three or four years now. I recently purchase Writing and Presenting in English: The Rosetta Stone of Science by Petey Young. All experience was great. The books arrive on time with good quality of book and in very good condition. I love shopping with Amazon. I will recommend everyone to try them because you will not be disappointed. Keep up your good services Amazon.