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.

Input: Consider Input: Article: London--A morning's train ride away, across the Channel, English kids talk about Liverpool's soccer team in a Paris puB.Some Parisians have even started to go to work in London.In the 19thcentury, Charles Dickens compared the two great rival  cities, London and Paris, in " A Tale of Two Cities".These days, it might be A Tale of One City. Parisians are these days likely to smile in sympathy at a visitor's broken French and respond in polite English.As jobs grew lack at home over recent years, perhaps 250,000 Frenchmen moved across the Channel.With an undersea tunnel, they could travel between cities in three hours.The European Union freed them from immigration and customs. Paris, rich in beauty, is more attractive.But London feels more full of life, and more fun until the pubs shut down. "For me, the difference is that London is real, alive," said Trevor Wheeler, a banker. Chantal Jaouen, a professional designer, agrees."I am French, but I'll stay in London," she saiD. There is, of course, the other view.Julie Lenoux is a student who moved to London two years ago."I think people laugh more in Paris," she saiD. In fact, London and Paris, with their obvious new similarities, are beyond the old descriptions.As the European Union gradually loosened controls, Londoners  _ into Paris to shop, eat and buy property . "Both cities have changed beyond recognition." Said Larry Collins, a writer and sometimes a Londoner.Like most people who know both well, he finds the two now fit together comfortably. "I first fell in love with Paris in the 1950s and it is still a wonderful place," Collins saiD."But if I had to choose, it would be London.Things are so much more ordered, and life is better." But certainly not cheaper.In fancy parts of London, rents can be twice those on Avenue Foch in Paris.Deciding between London and Paris requires a lifestyle choice. Like Daphne Benoit, a French journalism student with perfect English, many young people are happy to be close enough so they don't have to choose. "I love Paris, my little neighborhood, the way I can walk around a centre, but life is so structured," she saiD."In London, you can be who you want.No one cares." 
 Answer: A Modern Tale of Two Cities

Output: The best title for this message is   _  .


Input: Consider Input: Article: In the Caucasus region of Russia, nearly 50 out of every 100,000 people live to celebrate their 100th birthday, and many don't stop at 100! By comparison, in America only 3 people in 100,000 reach 100. But these Russian old people aren't alone. The Pakistanis, who live high in the Himalaya Mountains, and the Ecuadorans of the Andes Mountains seem to share the secret of long life, too. These people remain healthy in body and spirit despite the passage of time. While many older persons in industrial societies become weak and ill in their 60s and 70s, some Caucasians aged 100 to 140, work in the fields beside their great-great-grandchildren. Even the idea of aging is foreign to them. When asked "at what age does youth end?"most of these old people had no answer. Several replied, "Well, perhaps at age 80." What accounts for this ability to survive to such old age, and to survive so well?First of all, hard physical work is a way of life for all of these long-lived people. They begin their long days of physical labor as children and never seem to stop. For example, Mr . Rustam Mamedov is 142 years of age. His wife is 116 years old. They have been married for 90 years. Mr. Mamedov has no intention of retiring from his life as a farmer. "Why?What else would I do?"he asks. All these people get healthful rewards from the environment in which they work. They all come from mountainous regions. They live and work at elevations of 1,660 to 1,000 meters above sea level. The air has less oxygen and is pollution-free. This reduced-oxygen environment makes the heart and blood vessel  system stronger. Another factor that may contribute to the good health of these people is their isolation. To a great extent, they are separated from the pressures and worries of industrial society. Inherited factors also play some role. Most of the longest-lived people had parents and grandparents who also reached very old ages. Good family genes may, therefore, be one factor in living longer. 
 Answer: are still working in the fields

Output: The example of Mr. and Mrs. Mamedov implies that some Caucasians aged 100 to 140   _  .


Input: Consider Input: Article: The temperature is rising again in the Arctic. The sea ice area has dropped to one of the lowest levels on record, climate scientists reported last week. "The new Arctic Report Card tells a story of widespread and continued effects of a warming Arctic," said Jackie Richter-Menge of the US's Cold Regions Research and Engineering Laboratory. "This isn't just a climatological   effect. It impacts the people that live there," she added. Scientists concerned about global warming focus on the Arctic because that is a region where the effects are expected to be felt first, and that has been the case in recent years. There was a slowdown in Arctic warming in 2009, but in the first half of 2010 warming was near a record pace. The monthly readings were over 4 degrees Celsius above normal in northern Canada, according to the report card. The report card was prepared by 69 researchers in eight countries. Researchers said last winter's big snow storms that struck some Northern countries were tied to higher Arctic temperatures. "Normally the cold air is bottled up in the Arctic," said Jim Overland of the US National Oceanic and Atmospheric Administration. "But last December and February, winds that normally blow west to east across the Arctic were instead bringing the colder air south," he said. "As we lose more sea ice... warming in the atmosphere can create more of these winter storms," Overland said. There is a powerful connection between ice cover and air temperatures, Richter-Menge explained. When temperatures warm, ice melts. When ice melts it shows darker surfaces underneath , which absorb  more heat. "That, in turn, causes more melting and on the cycle goes," she said. In September the Arctic sea ice extent was the third smallest in the last 30 years, added Don Perovich of the US Army Laboratory. He said the three smallest ice covers have occurred in the last four years. 
 Answer: by studying the region they can make predictions about the future impact of global warming


Output: Scientists care so much about the warming in the Arctic region because  _  .


