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

Now, solve this: Article: Hong Kong businesses hit by nearly two months of illegal street occupations breathed a collective sigh of relief on Wednesday. Police finally cleared illegal protesters camped at the main intersection in the Mong Kok district, arresting two student leaders. More than 7,000 officers backed bailiffs (,)clearing occupied sections of Argyle Street and Nathan Road. The two-day operation saw 148 people arrested for various offenses, including contempt of court, resisting arrest, possession of offensive weapons, unlawful gathering and attacking police. The Chief Leader Stephen Hui said 22 officers were injured during the clearances. Police used pepper spray and batons to keep protesters from reclaiming cleared roads and from spreading the illegal occupation to neighboring streets. Six-lane Nathan Road, which goes through the heart of Kowloon, was cleared after nearly five hours. However, comments on the Internet said protesters were looking to reoccupy roads later in the evening. This week's actions mark the first time the authorities have successfully cleared one of the three main protest sites, which sprang up after demonstrators seized key intersections in late September to press for unconstitutional reforms. Contractor Kwan Sui-sum, 55, said he wished the Nathan Road clearance had come earlier, as he has had to pay HK$20,000 ($2,580) after the protesters delayed building reconstruction work. The owner of the Chung Hing Duty Free drug store was cautiously optimistic and eager for his store at the corner of the cleared intersection to get back to business. Sales dropped by 40 percent during the occupation, he said. "I'm not worried about the guess that the protesters will return. I trust in Hong Kong's rule of law and in the police," the man said, who wished to remain unknown as he fears attack from protesters. But five stores at a cleared site owned by jewelry chain Chow Tai Fook were still closed hours later. A company spokesman said the outlets will remain shut while it continues to monitor the situation.
Answer: the Hong Kong police cleared the roads at a cost
Solution:
You can infer from the passage that _ .