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.

Let me give you an 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
The answer to this example can be: Researchers did experiments on kids in order to find out _ .
Here is why: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

OK. solve this:
Article: Aside from doing schoolwork and studying, American students must also participate in various extra-curricular activities. Many students get involved in their communities by doing volunteer work at various local organizations. In fact, the school I attend even requires students to perform a certain number of hours of volunteer work per semester. It is part of our study hall grade, as well as a graduation requirement. There are many places to do volunteer work in the community. Some of my classmates volunteer at the local animal shelter, the community table (which provides free meals for needy families), charity stores, and many others. Finding a suitable place to volunteer usually depends on what's available, as well as personal interests. For example, a friend of mine who enjoys swimming volunteers at the recreation center to teach young children how to swim. With all these options out there, I ended up doing most of my volunteer work at a school library and a non-profit bookstore called Friends of the Library. This bookstore sells donated books at cheap prices, and all the profits made are donated to the local library. I thought it was very fitting that I do my volunteer work at a library and a bookstore, because reading has always been very important to me. I love working in the bookstore now, because every sale we make helps our public library expand, and gives it the funds needed to purchase new books. I think everyone should have the opportunity to read, and that we each should do our part to help those who don't have the chance. There is a charity event, called One Book for A Window of Opportunity, in which Chinese students can donate a book to the children of the poor village Fangmaping. They don't have a lot of resources, so reading can be a challenge. To find out more about this event, please visit: http://bbs.enfamily.cn/thread-739278-1-1.html.
Answer: an American student
Answer:
This passage is written by _ .