Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following 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
Solution: Researchers did experiments on kids in order to find out _ .
Reason: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

Now, solve this instance: Article: I was not quite seventeen when I decided to join the US Marine Corps.My mother tried her best to talk me out of my dream, and then finally signed the papers that would permit me to enter the service. One day, nearly two years after the Philippines became my home, I was summoned to the office of Lieutenant Colonel Boyd.He seemed to be a kind man, but I was pretty sure that he hadn't called me in to pass the time of day. Standing before his desk, I waited nervously as he read through some paperwork.Then he looked up."Why, Private, haven't you written to your mother for more than six months?" I felt weak in my knees.Has it been that long? I thought. "I didn't have anything to say, Sir." Lieutenant Colonel Boyd told me that my mother had contacted the American Red Cross, which in turn communicated with my commanding officer about my failure to write. Then he asked, "Do you see that desk, Private?" "Yes, Sir." "Open the top drawer and you'll find some paper and a pen.Sit down right this minute and find something to say to your mother." "Yes, Sir." When I finished a brief letter, I stood before him again. "Private, I'm ordering you to find something to say to your mother at least once a week.Do you understand?" I did. Some 35 years later, my aged mother's mental condition was deteriorating, and I was forced to place her in a convalescent home .As I went through her belongings, I began inspecting the contents of an old cedar chest.At the bottom, tied with a bright red ribbon, I found a bundle of letters. They were the letters I had been ordered to write from the Philippines.I sat on the floor of her apartment that afternoon reading each one, tears streaming down my cheeks.I now realized how deeply, as a young man, had upset her by my lack of consideration. The lesson I learned may have been too late to help my mother, but it's still done me good.These days I don't need a commanding officer standing over me to write to my loved ones on a regular basis.
Answer: did not agree with him at the very beginning
Student:
When the writer decided to join the US Marine Corps, his mother _ .