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: If you take a look at the best-selling books in theprefix = st1 /UKthese days, it is almost certain that there will be a lot of autobiographies in that list. Bill Clinton, Nelson Mandela and actor Michael J Fox have all written them. An autobiography is the story of a person's life, written by that person. It is usually a very famous person who might tell us all about their childhood, how they became famous and any other interesting things that have happened in their lives. Traditionally, someone would write an autobiography when they were older because they had had a long, successful life. However, these days there are many magazines with stories and photos of the stars which sell very well. Reality TV shows are extremely popular and lots of people become famous very easily just from being on the TV rather than being able to sing or act well. As a result, people become famous very quickly and as soon as they are famous, a lot of money can be made from writing an autobiography, even if they are very young. So now you can find an autobiography from almost everyone who is in the public eye. Even though we can follow the lives of the stars very closely on TV or in magazines nowadays, we maybe don't know how they live their lives from day to day. Autobiographies often give the information we never knew about the stars. The British public are very curious to find out more so they are very eager to read autobiographies. Not every star wants to write though. Sometimes stars employ writers to write their life stories for them. The writer will interview the star, listen to everything they want to say, record interviews and then write the book based on their words. David Beckham did this with his book My Side. Not everyone likes to read books regularly but they might like to read about the lives of stars. Autobiographies are helping to get more British people reading books. About 100 million autobiographies are sold inBritainevery year. More stars depend on them for extra income and as more of these books appear in the shops, more people are sure to keep buying them.
Answer: someone's life story normally written by themselves
An autobiography is_.

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
According to Coutu, _ .

Article: Have you ever heard of blogs ? If you haven't, you should have. It's here, it's growing and it's having an influence on our life. Surf the Internet and you'll find blogs everywhere. A blog, shortened from "weblog", is a public Internet journal written by one person or a group of people. It is a website in which a person or a group can place news, personal thoughts, text, photos, video or audio files, or links upon which visitors can comment. A blog lets you post on the Internet without having to know web design or be technical. You are given an environment to make dated entries on the topic of your choice which are "published", so other people can read them. Authoring a blog, maintaining a blog or adding an article to an existing blog is called "blogging". Blogging has revolutionized Internet publishing in the last several years because it gives everyone with Internet access the opportunity to become an online writer. Objects, such as "text and photos" in a blog can be called "blog posts", "posts", or "entries". The person who posts these entries is called a "blogger". Now, somewhere around the world, a blog is created almost every 6 seconds. Because it's great potential, Bill Gates views it as important as e-mail, BBS, and MSN. He's trying to make blogs the important tools for future business communications.
Answer: an Internet journal
A blog is _ .