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: My first visit to London was one and a half years ago. It was a wonderful trip. I stayed in the city for three weeks, and I had many impressions. I visited all the famous places. I'd like to tell you about some of the places I visited in this beautiful city. First, I went to the Tower of London, and I want to say that it is a very interesting historical place. I found out that a long time ago, it was a prison. Later it became a castle for the royal family. Or maybe it is the reverse; I'm not sure, but later they left this place and lived in Buckingham Palace and Kensington Palace. I also enjoyed visiting the House of Parliament and Westminster Abbey, two very popular places for tourists. They are very old and beautiful. The Abbey is built in a kind of Gothic style; it is fantastic. In London, you can also enjoy nature. There are many parks such as Hyde Park, Green Park, and Holland Park. These parks are wonderful green, quiet places where you can relax and escape the noise of the city. Trafalgar Square is a popular place for students and other young people. You will find lots of pigeons there. If you have time, you can feed them and they will be very happy. You can buy special food for them, but be careful! Tons of birds are going to surround you if you feed them. Another very special place in London that I like is St. Paul's Cathedral which was designed by Sir Christopher Wren. I also was impressed with the museums in London. They're very popular. I found them interesting because you can learn about the history of England. I had a wonderful time in London. I really liked it because it is a city that is rich in history.
Answer: recall his/her first travel to London
Solution: The writer writes this passage to _ .