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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.
question:
Article: In the 19thcentury, Americans from the eastern states moved out west to settle in the rich new lands along the Pacific Coast. The most difficult part of their trip was crossing "the Great American Desert" in the western part of the United States by horse and wagon. The western desert can be very dangerous. There is little water and there are few trees. But the desert also has scenery of great beauty. Tall towers of red and yellow stone rise sharply from the flat, sandy valley floor. The scene has been photographed many times and appears in movies and on TV. In Arizona, man-made dams across the Colorado River have made two large lakes in the middle of the dry desert country. At Lake Powell, the red stone arch of Rainbow Bridge rises high above the blue lake. There are few roads. Many areas of Lake Powell's shore can only be reached by boat or on foot. But hikers in this empty desert land sometimes find very old native American pictures, painted on the rocks. In Death Valley, California, the summer temperature rises to 130degF--165degF. There is less than inches of rain each year. Death Valley is the lowest place in America---925 metres below sea level. In the 1800s, many travelers died when they tried to cross this waterless valley in the terrible heat. Although the desert is dry and seems empty, there is plenty of life if you look closely. Snakes and rats have learned how to live in the desert heat. They live underground and come out at night, when it is cool. Plants such as cacti need very little water. When it does rain in the desert (sometimes only once or twice a year), plants grow quickly, and flowers open in a single day. For a short time, the desert is covered with brilliant (very bright) colours.
Answer: wanted to make their home there
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In the 19thcentury, Americans moved from east to west because they _ .

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Article: Thirteen-year-old Greg Hoffman had been begging his parents for an iPhone all year. So on Christmas morning he was thrilled to find the object of his desire under the tree, but there was a _ . The phone came with an 18-point set of terms and conditions that he had to agree to before the phone could be his. And the agreement did not come from Apple or the phone provider, it was from his mother. His mom, Janell Hoffman, included a contract along with the iphone that listed eighteen conditions or rules that Greg has to follow if he wants to keep it. Some of the rules limit the time he can use the phone; not after 7:30 p.m , and he can't take it to school. He also has to promise not to send "hurtful" text messages and e-mails to people; give his passwords to his parents, and always answer the phone when his mom or dad calls. Greg also has to use his own money to replace the phone if it's broken or lost Janell says the idea behind the contract is to teach her son to have a sense of responsibility and to learn to "co-exist with technology, not be ruled by it'. She told him not to use this technology to lie, fool, or cheat another human being. Most of the terms do not just apply to the iphone, but to life. She also advised him to, "keep your eyes up. See the world happening around you," "Stare out a window. Listen to the birds. Take a walk. Talk to a stranger. Wonder without Googling." "You are growing up in a fast and ever changing world. It is exciting and enticing. Trust your powerful mind and giant heart above any machine. I hope that you understand it is my job to raise you into a well rounded, healthy young man that can function in the world and coexist with technology, not be ruled by it," "I love you. I hope you enjoy your awesome new iPhone. Merry Christmas!"
Answer: teach him to have a sense of responsibility
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Mom gave her son the 18-point contracts with the iphone in order to _

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Article: The emotions of the athletes in the prize-awarding moments are often some of the most unforgettable images of the Olympics.Yet, a number of people have noticed some strange things.Yes, the gold medal winner is filled with pride and excitement, which is to be expected.Yet often, it seems the bronze medal winner is happier than the silver medalist.It is strange that the 3rd place contestant might be happier than someone who did better (the 2nd place).How can this be so? "What if reasoning can help to explain this interesting effect. In order to understand our world and our choices, we often imagine how things could have been different.A wife may ask, " Would I be happier today if I had married someone else?" Likewise, a student may think, "If 1 had chosen another major, maybe I would have a better shot at getting into graduate school." In short, " what if thinking allows us to mentally create alternative to our reality. In the Olympics, the "what ifs" of the winners are different.Clearly, the "what ifs" for the gold medalist involve not being No.1--this thought makes this athlete realize how fortunate he or she is.For the bronze medalist, the "what ifs" involve not being on the medal list at all, producing positive feelings.However, for the silver medalist, the "what ifs" can easily make the athlete ponder how things could have been different if he or she has won the gold medal (e.g.what if I practiced harder, and what if I had not made the small error in my routine).Thus, the "what ifs" that come to mind of the 1st and 3rd place finishers are positive, but the 2nd place finishers have a number of dissatisfying alternatives to reality that can make them feel less happy.
Answer: why bronze medal winners are happier than silver medalists
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This passage is mainly about _ .