Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
I have bought several of the Vitality canned dog food products and have found them all to be of good quality. The product looks more like a stew than a processed meat and it smells better. My Labrador is finicky and she appreciates this product better than most.
Solution: Positive
Reason: It's a positive review because the owner of the dog is satisfied with the product and mentioned that their dog appreciates the product.

Now, solve this instance: I bought this without realizing that it is a product of Taiwan. Considering all the health risks from eating foods made in China, I don't think I can trust the ingredients used in this product. As I understand, Taiwan, Japan, and Korea, all import many food ingredients from China, and they have found many harmful chemicals in them (I am not even including those that are unsanitary, i.e. made from sewer water). So what guarantee is there that this product do not contain carcinogens or other harmful chemicals? FDA do not, and cannot, test every single foreign product coming into U.S. Eat at your own risk.
Student:
Negative