You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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: Young Jack moved to a new house. When entering his new bedroom, he saw that it was full of toys but it was tidy. That day he played all he liked, but went to bed without tidying up. The next morning, when Jack got up, he found all the toys had been put back in their proper places. He was sure that no one had entered his bedroom, but the boy didn't pay much attention to it. The exact same thing happened that day, and the next day. But on the fourth day when he went to get his favourite toy, the toy jumped out of his hands and said, "I don't want to play with you!" Jack felt surprised, but the same happened with every toy he touched. Finally, one toy said to him: "We don't want to play with you. You always leave us so far away from our proper places. You don't know how _ it is for us to climb back up onto the shelves, or jump into the box. We feel most uncomfortable and unhappy. You don't know how uncomfortable and cold the floor is! We don't play with you any more if you don't promise to leave us in our proper places before you go to bed." Jack remembered how comfortable he felt in his bed and how bad he felt when he had once slept in a chair. He realized how badly he had treated his friends, the toys. He asked for their forgiveness , and from that day on he always put his toys nicely in their proper places before he got into bed.
Answer: he found lots of toys
Solution:
when Jack moved into his bedroom, _ .