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.
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
Example solution: Researchers did experiments on kids in order to find out _ .
Example 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: China is home to the invention of silk and has a long tradition of producing fine materials for clothing. Not all clothing in ancient or contemporary( ) China is made of silk, however. In fact, silk was only available to the wealthy classes for much of China's history. Until the introduction of cotton during the Ming Dynasty, from the 14th to the 17th century, the poorer classes wore rough clothing made from fibers . In ancient China, the tunic was particularly popular . Called hanfu , both men and women could be seen wearing tunics made of different materials. Women's tunics were long and loose , extending all the way down to their feet and often _ with a belt or rope to get tighter . Men's tunics were shorter, usually only extending down to their knees. During the winter, both men and women would wear cotton jackets for warmth. In the winter, men would also wear pants or ankle-length skirts into their clothes to keep warm and protect their legs against the cold winter conditions. Contemporary Chinese clothing is now made of many of the same materials as contemporary clothing found in other countries. Much of the traditional Chinese clothing produced now is made of cotton and silk, but generally contemporary Chinese clothing also contains synthetic fibers in with the cotton and silk, such as nylon . In addition, linen is now commonly used in contemporary Chinese clothing, especially during the summer months because it is light and breathable.
Answer: silk
Solution: In ancient China, only wealthy people could afford clothes made from _ .