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: The place is England. The year is 1928. One of the founding theorists of quantum mechanics , Paul Dirac, is scratching his head because solutions to his equations have _ unexpected results. For the solutions to make sense, he reasons, there must be a particle that has the mass of an electron but the opposite charge. At the time, such a thing was not known to exist. Several years pass before American physicist Carl Anderson observes a "positive" electron, or positron that confirms Dirac's prediction. Antimatter , as the name implies, can be described as the opposite of ordinary matter. Every particle in the universe has characteristics such as mass and charge. With antimatter, the mass remains constant, but the sign of the charge is reversed. All particles have an antimatter counterpart , even the chargeless neutron . Unlike matter, antimatter is not common. Unless you're in the upper atmosphere, or inside a particle accelerator, you're not going to come across it. "Antimatter was not always so rare," Stephane Coutu, Penn State particle physicist says. There was a time when it was as prevalent as matter itself. "Right after the Big Bang ," Coutu explains, "we believe there must have been exactly the same amounts of matter and antimatter...and yet owing to some small asymmetry in the laws of particle interactions, all of the antimatter and most of the matter in the early universe was annihilated . We are left today with the resulting matter-dominated universe." Science fiction is rife with tales of high-energy particle annihilation, and indeed, antimatter weapons have appeared in current bestselling novels. This is unrealistic, Coutu says. "[It] would be very impractical owing to very great difficulties in producing and maintaining significant amounts of antimatter." Technology that uses the properties of antimatter is actually feasible outside of science fiction, however. Positron emission tomography (PET) is a medical technique that can be used to detect cancer, measure blood flow and detect coronary artery disease. While antimatter may never be used as a bomb, it certainly has a positive future in life-saving medical diagnostic tools, the anti-weapon.
Answer: It's not easy to produce and maintain large quantities of antimatter
[A]: According to Coutu, _ .

[Q]: Article: Annual holidays have become a luxury and are no longer a staple of family life, according to government research. A getaway of a week or more is no longer considered essential by many families and is often beyond their reach, said the analysis of what parents and children say they really need. Fashionable clothes for the children, expensive birthday parties and lots of toys are also on the list of luxuries families don't have to have. Instead, recession -hit parents are thinking of the future, and the things they want for their children centre around learning to behave properly, good education and good health. Their picture of what a family ought to have includes a space to eat together away from the television, plenty of fruit and vegetables, and bicycles so children can get exercise. The breakdown of necessities and luxuries was prepared by researchers from the Department for Work and Pensions(DWP) who were trying to establish an up-to-date picture of what parents say they really need. Their findings show how families have scaled down their expectations in the face of economic difficulties -- how parents are now concentrating their attention and money firmly on the long-term interests of their children. Many believe that while it is vital for a family to do things together, day trips or weekend breaks are enough. Spending on furniture or decorating the house was also considered luxurious, unless the state of the home was so bad it became difficult to invite visitors in. Instead, researchers said: A family home should have an area where the family can eat together, not on their laps in front of a television. Families should be able to go on outings, overnight trips and possibly short holiday: the fact of being able to share these experiences is more important than the precise activity and its cost.
Answer: day trips or weekend breaks are enough for families to share experiences
[A]: In the opinion of most parents, _ .

[Q]: Article: I was with a group of businessmen, and we were dealing with a question--What is a good person? At a certain point during the discussion, one of the students--a young man of about thirty--described an event that happened at Christmas. He and his five-year-old son were decorating the Christmas tree, and a little boy came to the front door begging. If you ever visit Mexico, you will see that the people there take begging as nothing to get upset about and nothing to get embarrassed by. So, this little boy came to the door, a boy about the same age as my student's son. The father and the son went to the front door, and the father went back with his five-year-old son and said to him, "Give him one of your toys." At the words, the little boy quickly picked up some toy, and his father said to him, "No, no-give him your favorite toy." And the little boy, like a little tiger, said, "No way!" He cried; he refused. But the father, like a big tiger in a way, insisted gently, "No, you must give him one of your favorite toys." And finally the boy, with his head down, picked up a toy he had just gotten. The father waited in the living room, and the boy walked to the front door with the toy in his hand. The father waited and waited. What do you think happened? After a couple of minutes, his son came running back into the living room, his face radiant . "Daddy," he said, "can I do that again?" I think I have got the answer to the question.
Answer: begging is considered as a normal part of life
[A]:
From the passage, we can learn that in Mexico _ .