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: In the summer of 1980 a Spanish tourist, Gaspar Carner, went to Great Britain on holiday. When he was travelling in Scotland, he decided to visit Loch Ness, the famous lake where people say there is a monster. But while he was going across the lake in a boat, his bag fell into the water. In the bag were his passport, car keys, pen, and all his money. Loch Ness is 150 metres deep, so he didn't expect to see the bag again! Fourteen years later, in 1994, some scientists decided to explore the lake. They looked for the Loch Ness monster. Suddenly one of them saw something black in the water. They carefully went nearer. They thought the black thing was the monster. They went nearer and nearer. It was a bag. They took the bag out of the lake. They found that the photo on the passport was still clear. One of the scientists happened to be familiar with Gaspar Carner. So the bag was returned to him. 
 Answer: there may be a monster

Solution: The reason why the lake is famous is that   _  .