user: 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.

Q: Article: A high school history teacher once told us, "If you make one close friend in school, you will be most fortunate. A true friend is someone who stays with you for life." Experience teaches that he was right. Good friendships are just not easily formed. Why? One reason is that it is easy to move around in our society. Mr. Darrell Sifford, a news reporter for the Washington Daily, has been studying and talking about friendships for a number of years. He reports what one woman thought about the effect of ease of movement on friendship: "I was nine, and we'd just moved from South Carolina to New Jersey, and I didn't know anybody. _ and she said to me, 'Amelia, I know you're feeling bad because you don't have any friends. But you can fix that. Just walk across the street -- I know there's a girl about your age over there -- and knock on the door and ask her to be your friend.'" "As a 9-year-old, I could do that. I knocked on the door and said, 'Hi, my name is Amelia, and I'd like for us to be friends.' And to my surprise, she said that she would like that too--and we became friends." She added that going about it directly always worked when she was a child. But as she left childhood, she found that the simple direct approach was more and more difficult for her to follow. So, as an adult, Amelia longed to have friends but her hands were tied when it came to doing anything about it. The problem, according to her, is that society teaches us in a number of ways that direct action is not an acceptable way of doing things. We need to be less direct so that our feelings will not be hurt if our offer of friendship is refused. Mr. Sifford goes on to describe his own ideas on the subject: "To most of us, friendship is very important, but we need to have clear in our own minds the kinds of friendships we want. Are they to be very close or kept at arm's length? Do we want to share ourselves or do we want to walk on the surface?" "For some people, an ordinary friendship is enough -- and that's all right. But at some point we need to make sure that what we expect from the friendship is the same as what our friends expect from it. If one wants more from the friendship than the other, and if this is not talked about, one is likely eventually to feel that he's not being given enough attention. "The sharing of close secrets, including our fears as well as our dark dreams, is the surest way to deepen friendships. But the process must be gone through slowly and continued only if there are signs of interest and our efforts are answered." What are some of the problems in forming friendships? According to Mr. Sifford, the biggest problem is to expect too much too soon. Deep relationships take time. Another "big difficulty" is to think one "possesses" the other and that he should spend all his time only with you. Similarly, friendships require action from both sides. In short, you must give as much as you take. Finally there is a question of developing friendship. Unless you spend enough time together, talking on the phone, writing letters, doing things together, friendships will gradually fade away. Why is it so difficult to form friendships? Perhaps it is possible, as Mr. Sifford states, that we simply do not stay in one place long enough for a true friendship to develop. However, we all agree that each of us should think carefully about the kind of friendships we want. As in all interpersonal relationships, success depends on the kind of friendship we expect to have, openness to others, and a willingness to experiment. 
 Answer: her mother was able to solve difficult problems

A: By saying that "My mother had a way of getting to the root of things..." the author means that   _  .
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Q: Article: April Fool's Day , was a day of laughing and jokes. This day is kept in many countries, not only in Britain and the USA. This is a day to play jokes and make people laugh. Nobody knows when was the beginning of this custom. Some people connect it with the end of winter and the return of spring which make people merry and ready to play jokes. In Scotland young people were sent for hen's teeth or bird's milk and everybody laughed when they could find such things. In the USA and Britain some people could place a sign on a person's back with the words "push me!" Children often tell a grown-up that his sock is torn or he has something black on his face, and then shout "April Fool!" There is also the old purse  trick. A purse is left lying in the street, but when someone wants to take it, it is quickly pulled back by a string which the hidden joker holds in his hand. Or the purse may be filled with stones. Sometimes invitations are sent to people, asking them to come and visit somebody, but when they come they see that nobody expects them. Some people like to telephone to the zoo on the day and ask for Mr. Fish, Miss Fox or Mrs. Cat. All these jokes are very old but still they make people laugh. 
 Answer: Someone

A: _  knows when the custom of April Fool's Day started.
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Q: Article: Li Denghai, with his muddy boots and tanned  face, may not look like he is one of China's famous agricultural pioneers. But the 61-year-old man from Shandong Province has made scientific breakthroughs , which made great contributions to China's food security . His main work has been in achieving the higher output of corn production. Li, who holds the world record for the highest output of summer corn, once says, "Corn has a life; it sings and dances. If you listen clearly, it can speak to you." He started his research in 1969 when he was 20 and just dropped out of a high school. He then read an article which pointed that corn output per mu in the USA was six times higher than that in China. He was shocked and set out to work on just a small piece of land _ to see if he could increase the output. He often went to the field with a flashlight late at night, if he had been away during the day. By careful nurturing   he managed to double the output. Li Denghai was awarded the "China Award for Significant Contribution to the Maize   Industry" in 2005, and the same year the company named after his own name came into the market on the Shenzhen Stock Exchange. Li, however, is never happier than when he is in the middle of his cornfields. "I can forget my tiredness when talking to my corns," he says. 
 Answer: he was shocked that the corn output in China was so low

A:

assistant: When Li Denghai began the study of corn,  _  .
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