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: Every day I go into the same coffee shop on the way to work. It's part of a large chain here in the UK. I am new to the anonymous act of kindness concept. I came across it recently. A few weeks ago I worked up the courage to ask the barista if I could pay for a coffee for someone later that day. He looked at me kind of strangely and said "okay" and then put the money into the drawer where some change was put. I walked out feeling doubtful whether this would happen and privately thinking he might just add the money to his tips. This chain stamps a card every time you buy a coffee and when you get 9 stamps, the 10th coffee is free. I had just completed my card today and was due a free cup of coffee next time, so I cheered up as I headed out of the coffee shop. I believe that giving the card to people on the street is better than giving them cash so I forgot about the barista and passed the card on to a homeless guy I met later. A week later I was in the same store and I ordered my usual coffee and a new barista said to me, "Your coffee is on us." I was surprised and asked why he would give me a free coffee. He said that the staff were allowed to give out one free coffee a day to anyone they chose. And that today I was the lucky one. He said they knew that I was a regular and that I was always so cheerful with the staff. By the way, I was not sure I had been the first lucky person in the morning! This put a big smile on my face but I decided to ask if I could choose to pay it forward to someone else instead. Finally, he gave me the power to make a decision.
Answer: felt proud of what he had done in the coffee shop
Student:
After the author paid for someone who would drink coffee there, he_.