In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.

[EX Q]: Passage: At the beginning of December 1910 Smoller, using the name Joe Levi, visited Exchange Buildings, a small cul-de-sac that backed onto the properties of Houndsditch. He rented No. 11 Exchange Buildings; a week later Svaars rented number 9 for a month, saying he needed it for storage. The gang were unable to rent number 10, which was directly behind their target, 119 Houndsditch, the jeweller's shop owned by Henry Samuel Harris. The safe in the jeweller's was reputed to contain between £20,000 and £30,000 worth of jewellery; Harris's son later stated the total was only around £7,000. Over the next two weeks the gang brought in various pieces of necessary equipment, including a 60-foot (18.25 m) length of India rubber gas hose, a cylinder of compressed gas and a selection of tools, including diamond-tipped drills.With the exception of Gardstein, the identities of the gang members present in Houndsditch on the night of 16 December 1910 have never been confirmed. Bernard Porter, writing in the Dictionary of National Biography, considers that Sokoloff and Peters were present and, in all likelihood, were two of those who shot the policemen who interrupted their burglary. Porter opines that Peter the Painter was probably not at the property that night, while the journalist J P Eddy suggests that Svaars was among those present. Donald Rumbelow, a former policeman who wrote a history of the events, considers that those present consisted of Gardstein, Smoller, Peters and Dubof, with a second group in case the work needed to continue into the following day, which included among their number Sokolow and Svaars. Rumbelow considers a third group on standby, staying at Hoffman's lodgings, to have comprised Hoffman, Rosen and Osip Federoff, an unemployed locksmith. Rumbelow also considers that present at the events—either as lookouts or in unknown capacities—were Peter the Painter and Nina Vassilleva.On 16 December, working from the small yard behind 11 Exchange Buildings, the gang began to break through the back wall of the shop; number 10 had been unoccupied since 12 December. At around 10:00 that evening, returning to his home at 120 Houndsditch, Max Weil heard curious noises coming from his neighbour's property. Outside his house Weil found Police Constable Piper on his beat and informed him of the noises. Piper checked at 118 and 121 Houndsditch, where he could hear the noise, which he thought was unusual enough to investigate further. At 11:00 he knocked at the door of 11 Exchange Buildings—the only property with a light on in the back. The door was opened in a furtive manner and Piper became suspicious immediately. So as not to rouse the man's concerns, Piper asked him "is the missus in?" The man answered in broken English that she was out, and the policeman said he would return later.
[EX A]: What is the last name of the man who knocked on the door of 11 Exchange Buildings?

[EX Q]: Passage: In 2007, Elderly sold more than 16,000 instruments. The company is a  dealer of Martin guitars, as well as other mainstream brands such as Guild and Fender. It sells used Gibson instruments, but not new models as a result of the Gibson lawsuit. Although the bulk of its business comes from guitar sales, the company carries a range of other instruments, such as banjos, ukuleles, mandolins, accordions, concertinas, bouzoukis, sitars, musical saws, and African thumb pianos. Some of the rarer instruments are purchased as collectibles. Elderly is an exclusive retailer of "LunchBox-A-LeLes", ukuleles made from various tin lunch box designs. The journal Bluegrass Unlimited has noted Elderly Instruments for carrying "elite" brands of instruments, such as Paul Duff mandolins, Huss & Dalton acoustic guitars, Stelling banjos, and Nash electric guitars. Elderly was once one of only two American retailers for Apitius Mandolins, now only sold directly. As part of its consignment business, Elderly sells "collections" of instruments that sometimes have rich histories. In September 2006, it placed the Dopyera family's personal collection of resonator instruments up for sale, including some of the Dobro and National brands. The Dopyera family was responsible for founding those companies and innovating the resonator instrument trade.Elderly Instruments carries a number of Martin guitars, including valuable vintage models. In interviews, Werbin frequently mentions Martins made before World War II as especially desirable and "memorable" pieces of the Elderly Instruments inventory. The guitars are sought after by musicians from the bluegrass and other genres. Werbin purchases some of the more valuable or interesting instruments for his personal collection, and has lent them to museums as temporary exhibits.Periodicals for the bluegrass genre such as Bluegrass Canada and Bluegrass Now have featured stories about Elderly and its selection of bluegrass instruments and repair services. Elderly employees maintain connections with the bluegrass industry by attending trade shows such as the International Bluegrass Association Trade Show in Louisville, Kentucky. At these shows, Elderly showcases typical bluegrass instruments, such as banjos, guitars, mandolins, fiddles and resophonic guitars, to musicians and businesspeople. Elderly Instruments staff members have set up organizations such as the "Friends of Bluegrass" to support local bluegrass musicians.Michigan Living magazine noted Elderly's liberal policy regarding the handling of instruments, something Werbin attributes to his difficulty shopping for Martin guitars in New York City in the 1960s. The magazine also notes that customers are encouraged to pick up and play any instrument, an unusual policy for a high-end instrument retailer. Impromptu "jam sessions" are frequent in the store, as customers try out guitars.
[EX A]: What is the name of the organization set up to support bluegrass musicians by the employees of the company that sold over 16,000 instruments in 2007?

[EX Q]: Passage: In 1983, theater and opera director Peter Sellars proposed to American composer John Adams that he write an opera about Nixon's 1972 visit to China. Sellars was intrigued by Nixon's decision to make the visit, seeing it as both "a ridiculously cynical election ploy ... and a historical breakthrough". Adams, who had not previously attempted an opera, was initially skeptical, assuming that Sellars was proposing a satire. Sellars persisted, however, and Adams, who had interested himself in the origin of myths, came to believe the opera could show how mythic origins may be found in contemporary history.  Both men agreed that the opera would be heroic in nature, rather than poking fun at Nixon or Mao.  Sellars invited Alice Goodman to join the project as librettist,  and the three met at the Kennedy Center in Washington D.C. in 1985 to begin intensive study of the six characters, three American and three Chinese, upon whom the opera would focus. The trio endeavored to go beyond the stereotypes about figures such as Nixon and Chinese Chairman Mao Tse-tung and to examine their personalities.As Adams worked on the opera, he came to see Nixon, whom he had once intensely disliked, as an "interesting character", a complicated individual who sometimes showed emotion in public.  Adams wanted Mao to be "the Mao of the huge posters and Great Leap Forward; I cast him as a heldentenor".  Mao's wife, on the other hand, was to be "not just a shrieking coloratura, but also someone who in the opera's final act can reveal her private fantasies, her erotic desires, and even a certain tragic awareness.  Nixon himself is a sort of Simon Boccanegra, a self-doubting, lyrical, at times self-pitying melancholy baritone."Goodman explained her characterizations:
A writer tends to find her characters in her self, so I can tell you ... that Nixon, Pat, Mme. Mao, Kissinger and the chorus were all 'me.' And the inner lives of Mao and Chou En-Lai, who I couldn't find in myself at all, were drawn from a couple of close acquaintances.
[EX A]:
What is the first name of the person who who had not previously attempted an opera, was initially skeptical, assuming that Sellars was proposing a satire?