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: Bonus culture has become the subject of many studies nowadays. Many people have been angered by the way some bankers and high officials seem to have been rewarded for failure. Others find the idea of offering many-million-dollar bonuses morally disgusting. But few have asked whether performance-related bonuses really do improve performance. The answer seems so obvious that even to ask the question can appear ridiculous. Indeed, in spite of all the complaints about them, financial encouragements continue to be introduced in more and more areas, from healthcare and public services to teaching and universities. So it may come as a shock to many to learn that paying for results can actually make people perform badly in many circumstances, and that the more you pay, the worse they perform. No one is arguing that bonuses can help companies and institutions attract and keep the best staff. Nor does anyone argue against the idea that you can encourage people to do specific tasks by linking payments to those tasks. Rather, the point is about how to get the best out of people. Do employees really perform better if you promise to pay them more for getting results? There are some obvious reasons why such payments can fail. It has been argued, for instance, that cash bonuses contributed to the financial crash, because traders had little enthusiasm to make sure that their companies enjoyed long-term survival. Most bonus projects are poorly designed, says Professor Malcolm Higgs. He thinks the reason is that organizations try to keep bonus arrangements simple. Nevertheless, he thinks bonus projects can work as long as they link the interests of individual employees with the long-term goals of a business. Bonuses can also encourage cheating. "Once you start making people's rewards dependent on outcomes rather than behaviors, the evidence is people will do whatever they can to get those outcomes," says Professor Edward Deci. "In many cases the high officials simply lied and cheated to make the stock price go up so they got huge bonuses." But the work of Deci and others suggests the problem with bonuses runs far deeper than poor design or cheating. In 1971, he asked students to solve puzzles, with some receiving cash prizes for doing well and others getting nothing. Deci found those offered cash were less likely to keep working on puzzles after they had done enough to get paid. These studies suggest that offering rewards can stop people doing things for the pure joy of it. This was the basis for a series of books by Kohn in which he argues that rewarding children, students and workers with grades, scholarships and other "bribes" leads to low-quality work in the long run. Those who believe in the power of bonuses fail to distinguish between inner drive and outside pressure -- wanting to do something because you like it for itself in contrast to doing something because you want the reward, Kohn says. "It's not just that these two are different, it's often that the more you reward people for doing something, the more their inner drive tends to decline." A "do this and get that" approach might improve performance in the short term, but over longer periods it will always fail, Kohn says. People who receive bonus will naturally play safe, become less creative, cooperate less and feel less valued, he adds. What's more, the studies also suggest that offering rewards can also stop people taking responsibility.
Answer: take the function of bonuses for granted
Answer:
The effect of performance-related bonuses has not been well studied because people _ .