Detailed Instructions: 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.
See one example below:
Problem: 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 _ .
Explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment.

Problem: Article: If you bought some candy months ago but never ate it, how can you tell whether it's still safe to eat? The easiest way is to check the "expiration date " printed on the wrapper. If that date has already passed, you're likely to throw the candy away. But is that really necessary? According to a new report from the US Natural Resources Defense Council (NRDC), tons of food is wasted each year, largely because people don't fully understand what expiration dates, or "use-by dates", actually mean. Food dating was introduced in 1970s because customers wanted more information about the things that they were eating. When they first showed up, use-by dates were only supposed to indicate freshness because producers wanted their products to be tasted in their best conditions. But the truth is that these dates aren't related to the risk of food poisoning or food-born illness, according to Time News. However, most customers misinterpreted use-by dates and related them to the safety of the food, and they still largely do now. Eggs, for example, can still be eaten three to five weeks after purchase even though the use-by date is much earlier. When their use-by dates pass, strawberry juice may lose its red color and biscuits may lose their crunch , but they are not harmful. "It's a confusing subject, the difference between food quality and food safety," said Jena Roberts, vice president of National Food Lab, a US food testing company. "Even in the food industry I have colleagues who get confused." This is why scientists are calling for a standard explanation to be printed following the use-by dates. "We want this to be clearly communicated so customers are not misinterpreting the date and contributing to a lot of waste," said Dana Gunders, a staff scientist with the NRDC. But this won't be a mistake that is easy to correct since people have believed it for so long. Another problem is that the quality levels of different foods change differently-some are still eatable long after their use-by date while others are not. As a result, food industry officials are now thinking of changing the use-by date to a date indicating when food is most likely to throw away.
Answer: show whether the food was fresh
Solution:
According to the text, use-by date was first intended to _ .