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: Two-thirds of the world's major rivers have now been disrupted with more than 50,000 dams in an attempt to stole water and provide power. In the US,there are more than 85,000 dams,disrupting large and small rives, and in most cases transforming natural flow.The most famous of these,the Hoover Dam, constructed in the l930's,is mainly responsible for the fact that the Colorado River no longer reaches the ocean. Dams, besides all their attractive benefits, also have negative impacts. Creating a reservoir means a large area must be flooded. Communities may lose their land, houses and culturally impotent sites. Environmentally, the new reservoir can be a paradise for wildlife, especially birds. However, it can cause greenhouse gas emissions and poison the water for fish. Also, the dramatic rise and fall of water levels during dam releases is too extreme for plains and animals to cope with, resulting in dead zones around the shores of reservoirs. Fish that lay their eggs in the shallows, for example, may find a few hours later that those sites are high and dry. Dams don't just block water flow. They also prevent fish migrations, and are a barrier to sediment flows. Instead of rushing downriver, sediments get backed up against the dam wall, which cause the reservoir level to increase over time.However, sediments which are rich in nutrients have become a problem. The fertility of the entire system can be influenced, with soils lost during seasonal rains not being replaced. Perhaps the biggest problem can be seen in deltas , often host to large cities,which are sinking into the oceans. Groundwater is being extracted to feed the city, causing the urban weight to sink and sediments washed away by the ocean are no longer being replaced. The result is that sea level rise in cities from Shanghai to Alexandria.
Answer: find it easier to deal with the rise of water
Solution: With many dams built across rivers, fish will _