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.

Let me give you an example: 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
The answer to this example can be: Researchers did experiments on kids in order to find out _ .
Here is why: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

OK. solve this:
Article: As a foreigner,I don' t know the situation in the US well. Seeing all kinds of recent shooting incidents,I think it should be controlled more strictly than now. Somebody said that the person who has it in mind to kill another can do it without a gun,so the causes of murders are not guns but the trend of despising life in the US. And they also insist that there is no clear evidence that the increasing number of murders is connected with possession of guns,so the personal rights should not be restricted by the reason that there is not enough evidence. Several months ago,I agreed with that partly. But as we know,the private groups like NRA have used the public opinion and persuaded the government to protect their profit. Other weapons such as knives,razors ,bats are made for their own usage. But guns are made for only one reason--to kill someone. Of course,there are people who have guns to protect themselves from the criminals. But crime is getting more cruel and severe nowadays,so actually even if someone has a gun,it is impossible to guard himself completely. As a substitute ,I think,if the possession of guns is controlled more strictly,people can live safer lives than now. There are other reasons to oppose the gun control (e.g.the possession of guns is historical inheritance and represents that people's resistance will be against tyrannical government),but none of them can justify and explain today's serious situation in the US.
Answer: gun control
Answer:
The writer's purpose is to give his opinion about _ .