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 Input: Article: People have wondered for a long time how their personalities and behaviors are formed. It's not easy to explain why one person is intelligent and another is not, or why one is cooperative and another is competitive. Social scientists are, of course, extremely interested in these types of question. They want to explain why we possess certain characteristics and exhibit certain behaviors. There are no clear answers yet, but two distinct schools of thought on the matter have developed. As one might expect, the two approaches are very different from each other, and there is a great deal of debate between _ of each theory. The argument is often conveniently referred to as nature vs. nurture. Those who support the "nature" side of the conflict believe that our personalities and behavior patterns are largely determined by biological and genetic factors. That our environment has little, if anything, to do with our abilities, characteristics and behavior is central to this theory. Taken to an extreme, this theory maintains that our behavior is predetermined to such a great degree that we are almost completely governed by our instincts . Proponents of the "nurture" theory, or, as they are often called, behaviorists, claim that our environment is more important than our biologically based instincts in determining how we will act. Behaviorists see humans as beings whose behavior is almost completely shaped by their surroundings. Their view of the human being is quite mechanistic; they maintain that, like machines, humans respond to environmental stimuli (something that helps sb./ sth. to develop better and more quickly)as the basis of their behavior. The social and political connections of these two theories are significant. In the United States, for example, blacks often score below whites on standardized intelligent test. This leads some "nature" proponents to conclude that blacks are genetically worse than whites. Behaviorists, in contrast, say that the differences in scores are due to the fact that blacks are often robbed of many of the educational and other environmental advantages that whites enjoy, and that, as a result ,they do not develop the same responses that whites do. Neither of these theories can yet fully explain human behavior. In fact, it is quite likely that the key to our behavior lies somewhere between these two extremes. That the argument will continue for a long time is certain.
Answer: what makes different stages of intelligence
Example Output: The author is mainly concerned about solving the problem _ .

Example Input: Article: For Kim LeBlanc, knowing that her son Tyler's organs, eyes and other tissues have given life or healing to others is helping her cope with the loss of her child, who was struck by a truck in Guelph on May 31. Tyler was believed to have been texting a friend when he stepped onto a high-traffic road against the green light and was struck by the truck. Then he was sent to a Hamilton hospital. Surgery was performed to ease the pressure in his brain, but .the family was told he would not recover. "With all of his injuries, I just prayed all night for a miracle. And I was granted a miracle, but not in the way I'd expected," says LeBlanc, her voice choked by emotion. The family decided to donate Tyler's organs, a choice she believes her kind and considerate son would have made on his own. It's also a choice that transplant programs wish would be made more often, because the need for donor organs is far more than the supply worldwide. More than 1,500 people in Ontario are on the waiting list for life-saving organs, and one dies every day because an organ has not become available in time. Across Canada, the gap between donations and the need for organs continues to widen. At the end of 2010, more than 4,400 Canadians were on the waiting list for donor organs, including 3,362 needing a kidney. That year, 229 died before the organs they needed became available. LeBlanc recalls the morning when her son was taken off life support and his organs were removed. Despite living what she calls a parent's absolute worst nightmare, LeBlanc says she has got the strength to bear such an unbearable loss. "He's still there. He's still living. And he's still breathing. And he's brought so much joy to families," she says. "He's my hero. He really is my hero."
Answer: he broke the traffic rule
Example Output: Tyler was struck by the truck mainly because _ .

Example Input: Article: The idea of being able to walk on water has long interested humans greatly. Sadly, biological facts prevent us ever accomplishing such a thing without artificial aid--we simply weigh too much, and all our mass pushes down through our relatively small feet, resulting in a lot of pressure that makes us sink. However, several types of animals can walk on water. One of the most interesting is the common basilisk. Basilicus, a lizard native to Central and South America. It can run across water for a distance of several meters, avoiding getting wet by rapidly hitting the water's surface with its feet. The lizard will take as many as 20 steps per second to keep moving forward. For humans to do this, we'd need huge feet that we could bring up to our ears in order to create adequate "hitting. " But fortunately there is an alternative: cornflour. By adding enough of this common thickening agent to water (and it does take a lot), you can create a "non-Newtonian" liquid that doesn't behave like normal water. Now, if the surface of the water is hit hard enough, particles in the water group together for a moment to make the surface hard. Move quickly enough and put enough force into each step, and you really can walk across the surface of an adequately thick liquid of cornflour. Fun though all this may sound, it's still rather messy and better read about in theory than carried out in practice, if you must do it, then keep the water wings handy in case you start to sink--and take a shower afterward!
Answer: have biological limitations
Example Output:
Walking on water hasn't become a reality mainly because humans _ .