In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.
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Question: Very frustrated. Opened upon receiving so that it can expand. It's been 6 hours and still hard as a rock and curled up. Wondering how long it's going to take to expand to isn't normal shape.

Answer: negative

Question: Product damaged enroute! Refund sent? Only problem is now I must wait over a week for the money to be returned to my account so I can reorder it! Great customer service Amazon!!!

Answer: negative

Question: Box was empty. Well, the shipping box contained a case for the lenses, but the case was empty. So I apparently purchased a very expensive glasses case. Very disappointing.

Answer:
negative