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.
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
Example solution: Researchers did experiments on kids in order to find out _ .
Example explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

Problem: Article: Argentina in the late nineteenth century was an exciting place.Around 1870,it was experiencing an economic boom,and the capital,Buenos Aires,attracted many people.Farmers,as well as a flood of foreigners from Spain and Italy,came to Buenos Aires seeking jobs.These jobs didn't pay well,and the people felt lonely and disappointed with their new life in the city.As the unhappy newcomers mixed together in the poor parts of the city,the dance known as the tango came into being. At the beginning the tango was a dance of the lower classes.It was danced in the bars and streets.At that time there were many fewer women than men,so if a man didn't want to be left out,his only choice was to dance with another man so that he could attract the attention of the few available women.Gradually,the dance spread into the upper classes of Argentinean society and became more respectable. In Europe at this time,strong interest in dance from around the world was beginning.This interest in international dance was especially evident in Paris.Every kind of dance from ballet to belly dancing could be found on the stages of the Paris theaters.After tango dancers from Argentina arrived in Europe,they began to draw the interest of the public as they performed their exciting dance in cafes.Though not everyone approved of the new dance,saying it was a little too shocking,the dance did find enough supporters to make it popular. The popularity of the tango continued to grow in many other parts of the world.Soldiers who returned to the United States from World War I brought the tango to North America.It reached Japan in 1926,and in 2003 the Argentinean embassy in Seoul hired a local tango dancer to act as a kind of dance ambassador,and promote tango dancing throughout South Korea.
Answer: the capital of Argentina
Solution: The origin of the tango is associated with _ .