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.

Article: In 1901, H.G. Wells, an English writer, wrote a book describing a trip to the moon. When the explorers landed on the moon, they discovered that the moon was full of underground cities. They expressed their surprise to the "moon people" they met. In turn, the "moon people" expressed their surprise. "Why," they asked, "are you traveling to outer space when you don't even use your inner space?" H.G. Wells could only imagine travel to the moon. In 1969, human beings really did land on the moon. People today know that there are no underground cities on the moon. However, the question that the "moon people" asked is still an interesting one. A growing number of scientists are seriously thinking about it. Underground systems are already in place. Many cities have underground car parks. In some cities, such as Tokyo, Seoul and Montreal, there are large underground shopping areas. The "Chunnel", a tunnel connecting England and France, is now complete. But what about underground cities? Japan's Taisei Corporation is designing a network of underground systems, called "Alice Cities." The designers imagine using surface space for public parks and using underground space for flats, offices, shopping, and so on. A solar dome would cover the whole city. Supporters of underground development say that building down rather than building up is a good way to use the earth's space. The surface, they say, can be used for farms, parks, gardens, and wilderness. H.G. Wells' "moon people" would agree. Would you?
Answer: lived in so many underground cities
The explorers in H. G. Wells' story were surprised to find that the "moon people" _ .

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
The author is mainly concerned about solving the problem _ .

Article: When Marilynne Robinson published her first novel, Housekeeping, in 1980, she was unknown in the literary world. But an early review in The New York Times ensured that the book would be noticed. "It's as if, in writing it, she broke through the ordinary human condition with all its dissatisfactions, and achieved a kind of transfiguration ," wrote Anatole Broyard, with an enthusiasm and amazement that was shared by many critics and readers. The book became a classic, and Robinson was recognized as one of the outstanding American writers of our time. Yet it would be more than twenty years before she wrote another novel. During the period, Robinson devoted herself to writing nonfiction. Her essays and book reviews appeared in Harper's and The New York Times Book Review, and in 1989 she published Mother Country: Britain, the Welfare State, and Nuclear Pollution, criticizing severely the environmental and public health dangers caused by the Sellafield nuclear reprocessing plant in England--and the political and moral corruption . In 1998, Robinson published a collection of her critical and theological writings, The Death of Adam: Essays on Modern Thought, which featured reassessments of such figures as Charles Darwin, John Calvin, and Friedrich Nietzsche. Aside from a single short story--"Connie Bronson," published in The Paris Review in 1986--it wasn't until 2004 that she returned to fiction with the novel Gilead, which won the National Book Critics Circle Award and the Pulitzer Prize. Her third novel, Home, came out this fall. Her novels could be described as celebrations of the human--the characters in them are unforgettable creations. Housekeeping is the story of Ruth and her sister Lucille, who are cared for by their eccentric Aunt Sylvie after their mother commits suicide. Robinson writes a lot about how each of the three is changed by their new life together. Gilead is an even more close exploration of personality: the book centres on John Ames, a seventy-seven-year-old pastor who is writing an account of his life and his family history to leave to his young son after he dies. Home borrows characters from Gilead but centers on Ames's friend Reverend Robert Boughton and his troubled son Jack. Robinson returned to the same territory as Gilead because, she said, "after I write a novel or a story, I miss the characters--I feel like losing some close friends."
Answer: in 2004
Robinson's second novel came out _ .