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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.

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

New input: Article: I am a person who does not like to wait.I don' t like lines, being put on hold when making a phone call, arriving at an appointment to find that my companion will be delayed and of course, I don * t like waiting rooms. However, I realize that my agony will not be good for me, as an increasingly, crowded world can only mean one thing--more waiting. Owing to this, I have taken a measure and decided to turn my disappointment to productive ends.In short, I am looking for what I call "waiting in line books". These are books that contain material designed for being read in shortened words, so there is no extended story line to lose track of.Another requirement is that they be small enough to slip neatly into my back pocket. The other day I went to the supermarket.Convinced that the rain would keep most people away, I was surprised to see that the place was crowded with shoppers.Every checkout was open--and jammed! But I could take out my pocket book and go to work. The more the world demands that I wait, the more I learn from my waiting library.Look at these titles: One Hundred Things Every American Should Know; The Poetry of Robert Frost; Living Thoughts of Leading Thinkers; Still More Toasts.I have learned interesting and enriching things and much knowledge from these books. On a recent visit to the general store, I placed my order at the counter along with six or seven other people.The one female employee seemed to have her hands full as she rushed about."Just be patient," she said to me. No problem.I quietly opened my dictionary of prose and poetical quotations. Perhaps the other customers regarded me as a bookish, lonely soul.But little did they realize that I was enjoying the company of Shakespeare, Thoreau, Homer and Ben Johnson.
Answer: is becoming more and more crowded
Solution:
According to the passage, the world _ .