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.

Ex Input:
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

Ex Output:
According to Coutu, _ .

Ex Input:
Article: It has been two years since I published my first article on Yahoo!Contributor Network.I was very excited when I saw that what I had written was published on the Internet. I recognized that the content sites such as Associated Content can provide a fertile ground for learning how to become a writer.I was thrifty --I could see that this was an open door for systematically learning some basic writing skills without paying college tuition for classes,all to be finished at my own speed and without leaving the comfort of my own home. During these past few years I gained enough experience and understanding of using Associated Content to try writing.I found writing for that site was not my cup of tea.However,my experience there was positive as I was rewarded with even more learning opportunities just by giving it a try.Through Associated Content I was introduced to the world of bolgs .I decided to learn how to set up a blog myself.Now I'm interested in blogs and continue to work as a writer. Writing for the content site Yahoo!Contributor Network gives me a chance of trying creative writing--news,reviews and numerous lifestyle issues.And all of these topics are my own choices.Then there is an opportunity to meet other writers.Yahoo!Contributor Network has a wonderful in-house messaging system that allows its writers to communicate easily with one another.Not all your tries are satisfactory and easy when you write for a content site,but the benefits are many if you try it. My teacher once said,"If you don't quit,you will win."I have no desire to quit writing as I really enjoy it.My thanks go out to Associated content and yahoo!Contributor Network for all my progress in writing!And to my fellow writers--thank you so much for your support and friendship.May we continue in our efforts of inspiration for many years to come!
Answer: studying on Associated Content is rather expensive but convenient.

Ex Output:
According to the author, _ .

Ex Input:
Article: Studies show that laughter is something that makes you feel calm or relaxed for both physical and psychological wounds though it may seem futile to laugh in the face of pain and fear. When Dan Rather interviewed comedian Bill Cosby just one week after his son, Ennis, was killed, Cosby said, "I think it is time for me to tell people that we have to laugh. You can turn painful situations around through laughter. If you can find humor in anything, you can survive it." Call it a flashlight for dark times: laughter just seems to adjust attitude better than anything else. Inspirational speaker Steve Rizzo recalls a TV interview with an injured firefighter a few days after 9.11.The man had fallen more than 30 stories in one of the towers and had broken a leg. Everyone was crying, and the reporter asked, "How is it that you've come out of this alive?" He looked at her and without missing a beat, said, "Look, lady, I'm from New York and I'm a firefighter; that' all you need to know." "Everyone laughed and though the laughter was only a couple of seconds," says Rizzo. "Sometimes that's all you need to catch your second breath. Laughter gives you that couple of seconds. You're sending a message to your brain, and the message is: If you can still laugh even a little among the pain, you are going to be OK." Of course, there is a difference between laughing off a serious situation and laughing off the fear that results. The firefighter was doing the latter, states Rizzo, the author of Becoming a Humorous Being, and so should we. "If there is anything we have learnt from 9.11, it's how precious life really is," she says. "We have to send a message that our spirit won't die. One important thing that unites us is our ability to laugh."
Answer: laughter is a good way to get rid of pain and fear

Ex Output:
The writer uses the examples of the comedian and the firefighter to show _ .