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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.
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Article: If you give something to someone for free, will that person value it and use it? Development experts have debated this question for decades. Some think the act of paying causes people to value something and use it more. Selling necessary health treatments, others argue, may deny them to the people who need them the most. Consider, for example, chemically treated bed nets, which kill mosquitoes anti protect people against malaria while they are sleeping. William Easterly, an economist at New York University, believes this is one example of development having gone wrong. In a recent book, Professor Easterly suggests bed nets given free in Africa are often used for the wrong purpose. Yet, the World Health Organization (WHO) recommends bed nets be given out free and used by whole communities. The success of a large free bed net campaign in Kenya led the WHO to announce this recommendation This debate will likely influence social programs in the developing world. Many non-governmental organizations support the creation of self-supporting programs in poor countries. Goods and services are sold for a price to help these programs survive. According to Rachel Glenerster, who runs a research lab doing development and poverty studies at the Massachusetts Institute of Technology, her several studies have proven that small price changes have a big influence on the number of people who use a product. A price change will reduce the total amount of use of the product as well, she says. She has also found no evidence that the very act of paying for something changes how people use it. As for a particular product among special populations, some development experts argue that pricing is useful. When it comes to bed nets, Miss Glenerster says research shows no evidence of this. People are just as likely to use a bed net whether they paid for it or not.
Answer: a popular way to help the poor
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The debate among experts focuses on _ .

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Article: In Vietnam, two members of a family of street vendors are finding a way to help the poorest students in Hanoi. Pham Minh Dap and his brother are providing the students with mostly free English and Japanese lessons at a learning center they created. The men want to help people who would not normally have a chance to learn a foreign language. Some education experts in Vietnam say such knowledge may help college graduates get jobs. The country's economy has improved. But many graduates continue to have a hard time finding employment. Local media reported ten percent of university graduates do not have a job. Earlier this year, 24-year-old Pham Minh Dap and his brother established a school they call "Stand By You". Volunteers teach poor students English and Japanese. Many classes are free. Students with some language knowledge pay 25 to 50 cents per class. Mr. Dap pays about $ 500 to rent the language center space and for other costs. He gives about $ 150 from his earnings as a street Vendor and private language teaching. His brother gives the same amount from the money he earns as a secretary. Friends provide the rest. Mr. Dap and many of his family members have sold things outside HoaBinh Park in the center of Vietnam's capital for five years. They come from a village of rice farmers in Thanh Hoa Province. Twenty-four-year-old Pham THi Trang is one of 600 students at the language school. She is finishing her university studies. Her parents work in a market in a village in Ha Nam Province. She says life is hard in the city. She earns about $50 a month from a part-time job, and her parents give her $ 75. But this is not enough to live on. She has said she has to be very careful with money so she can pay her bills. Demand for the school is growing. About 1,000 people are on a waiting list to enter. Ten people have offered to teach for free. And Mr. Dap says he is hoping to raise money to pay for a bigger place. He wants to open more classes.
Answer: by two brothers
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"Stand By You" is established _ .

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Article: The US company iRobot made a new kind of sub-marine , called the Seaglider, last week. The robotic submarine was developed by researchers at the University of Washington. It is about 1.8 meters long and weighs about 52 kilograms. It moves through water at a speed of up to 20-25 kilometers a day and can stay at sea for up to six months before needing a battery recharged. This special character results from its special propulsion system . Unlike a traditional submarine, the Seaglider does not have a propeller . It has an air tank that is emptied and filled to adjust depth, as well as a pair of wings that help to guide and lead the submarine. A traditional submarine, on the other hand, "puts water inside tanks to make it heavier, or it will expel the water to make it lighter," explained Frederick, a professor at the University of Washington. Each time the Seaglider comes to the surface, it sends the data which it collects to its controllers by satellite. Operators can also send the submarine new information. For example, they can change its course in their office through giving the computer orders. Seagliders are already being used for scientific research, such as environmental studies. iRobot also hopes to sell the submarine to the military . At $100,000 each, the Seaglider is a cheap way to keep an eye on the ocean. "These things can go out there and monitor large areas of ocean because they're very persistent. They can go for thousands of miles on their own. At the same time, you can tell them to stay in one place and they can circle," says Helen Greiner, chairwoman of iRobot. "This is science fiction stuff in many ways, but it's really out there and working."
Answer: has an air tank to adjust depth instead of a propeller
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Unlike a traditional submarine, the Seaglider _ .