In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
One example is below.
Q: Article: Homework can put you in a badmood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay. 
 Answer: whether mood affects their learning ability
A: Researchers did experiments on kids in order to find out _ .
Rationale: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.
Q: Article: When people find out that the product they bought is unsatisfying or in some other way does not live up to the manufacturer's claims , the first step is to present the warranty , or any other records which might help , at the store of purchase . In most cases , this action will produce results . However , if it does not , there are various means the consumer may use to gain satisfaction . A simple and common method used by many consumers is to complain directly to the store manager . In general , the " higher up " his or her complaint , the faster he or she can expect it to be settled . In such a case , it is usually settled in the consumer's favor , assuming he or she has a just claim . Consumers should complain in person whenever possible , but if they cannot get to the place of purchase , it is acceptable to phone or write the complaint in a letter . Complaining is usually most effective when it is done politely but firmly , and especially when the consumer can demonstrate what is wrong with the item in question . If this cannot be done , the consumer will succeed best by presenting specific information as to what is wrong , rather than by making general statements . For example , " The left speaker does not work at all and the sound coming out of the right one is unclear " is better than " This stereo does not work . " The store manager may advise the consumer to write to be manufacturer . If so , the consumer should do this , stating the complaint as politely and firmly as possible . If a polite complaint does not achieve the desired result , the consumer can go to a step further . She or he can threaten to take the seller to court or report the seller to a private or public organization responsible for protecting consumer's rights . 
 Answer: show some written proof of the purchase to the store
A:
When people find that their purchase is unsatisfying , the first thing they should do is to   _   .