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: One of China's most popular folk arts is paper cutting . Archaeological  finds trace the tradition back to the 6thcentury; it is supposed that the beginnings of paper cutting were even a few centuries earlier. Paper cuttings are used for religious  purposes, for decoration  and as patterns . Today, paper cuttings are mainly used as decoration. They _ walls, windows, doors, columns mirrors, lamps and lanterns in homes. They are also used for decoration on presents, and are given as presents themselves. They are of special importance at festivals. At the Spring Festival for example, entrances are decorated with paper cuttings which are supposed to bring good luck. Paper cuttings are not produced by machine, but by hand. There are two kinds of paper cuttings; scissor   cuttings and knife cuttings. Scissor cuttings are fashioned with scissors. Several pieces of paper--- up to eight pieces---are fastened together. The motif  is then cut with sharp, pointed scissors. Knife cuttings are fashioned by putting several layers   of paper on a relatively soft foundation consisting of a mixture of tallow   and ashes. Following a pattern, the artist cuts the motif into the paper with a sharp knife which he usually holds vertically . The advantage of knife cuttings is that considerably more paper cuttings can be made in one operation than scissor cuttings. In the countryside, paper cuttings are usually made only by women and girls. This used to be one of the skills that every girl was to master and that were often used to judge brides . Professional paper cutting artists are, on the other hand, almost always men who have guaranteed   incomes and work together in workshops. 
 Answer: all of the above
Answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Paper cuttings can be used for   _  .