instruction:
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.
question:
Passage: Novelist Geoff and his wife Sally rent an isolated countryside bungalow to enable Geoff to finish his latest book without the distractions of life in London. On their arrival, they are horrified to find a dead man in the property; before they can report the discovery they are confronted by Duke, a gangland boss, and his henchmen who have, it transpires, been using the empty property as a hide-out for stolen valuables which they are planning to smuggle out of the country. A rival gangster, Juan, also has his eye on the goods and has discovered their whereabouts. The dead man is one of his minions.
Geoff and Sally are held captive, and matters take a turn for the worse when Juan and his men also arrive on the scene, forcing a stand-off between the two factions during which Geoff and Sally are roughly-treated by both sides. Duke starts to fall for Sally, and his obvious interest in her antagonises his girlfriend Rina. Eventually there is a bloody shoot-out between the rival gangs, with Duke's men getting the better of the exchange. Duke boards a plane to make good his escape with the valuables, but the plane is shot down by the jealous and vengeful Rina.
answer:
Who worked for Juan?


question:
Passage: The Willamette River ( (listen) wil-AM-it) is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is 187 miles (301 km) long, lying entirely in northwestern Oregon in the United States. Flowing northward between the Oregon Coast Range and the Cascade Range, the river and its tributaries form the Willamette Valley, a basin that contains two-thirds of Oregon's population, including the state capital, Salem, and the state's largest city, Portland, which surrounds the Willamette's mouth at the Columbia.
Originally created by plate tectonics about 35 million years ago and subsequently altered by volcanism and erosion, the river's drainage basin was significantly modified by the Missoula Floods at the end of the most recent ice age. Humans began living in the watershed over 10,000 years ago. There were once many tribal villages along the lower river and in the area around its mouth on the Columbia. Indigenous peoples lived throughout the upper reaches of the basin as well.
Rich with sediments deposited by flooding and fed by prolific rainfall on the western side of the Cascades, the Willamette Valley is one of the most fertile agricultural regions in North America, and was thus the destination of many 19th-century pioneers traveling west along the Oregon Trail. The river was an important transportation route in the 19th century, although Willamette Falls, just upstream from Portland, was a major barrier to boat traffic. In the 21st century, major highways follow the river, and roads cross it on more than 50 bridges.
Since 1900, more than 15 large dams and many smaller ones have been built in the Willamette's drainage basin, 13 of which are operated by the U.S. Army Corps of Engineers (USACE). The dams are used primarily to produce hydroelectricity, to maintain reservoirs for recreation, and to prevent flooding. The river and its tributaries support 60 fish species, including many species of salmon and trout; this is despite the dams, other alterations, and pollution (especially on the river's lower reaches). Part of the Willamette Floodplain was established as a National Natural Landmark in 1987 and the river was named as one of 14 American Heritage Rivers in 1998.
answer:
What organization operates 13 of the dams built in the river that is a major tributary of the Columbia river?


question:
Passage: Stephen Thomas Erlewine of AllMusic said that releasing the Spanish-language Fijación Oral, Vol. 1 after the success of the English-language Laundry Service was a "sharp move", complimenting the album for demonstrating that Shakira "can not only return to her roots, but expand upon them". He described "La Tortura" as a "natural for American radio", and felt that the parent album generated anticipation for the upcoming Oral Fixation, Vol. 2. Writing for PopMatters, Matt Cibula praised the album for its musical departure from Laundry Service, applauding the integration of subtle samples across several songs as "great nods to the sounds of the 1980s". Dave Simpson of The Guardian compared Shakira to a "Latin American Madonna", describing her vocals as reminiscent of "Cher and Hazel O'Connor, produced by Julio Iglesias".Jon Pareles of The New York Times found Shakira's "smart or ambitious" image to be uncharacteristic of a sex symbol. He praised the versatility of her multilingual lyrics and her experimentation in a number of genres, citing the "multiplicity" in "the arrangements, in the mixed emotions of the lyrics, [and] in Shakira's mercurial voice". Writing for Paste, Mark Kemp complimented Shakira for dispelling notions she is "the Latin Britney, the female Ricky Martin [and] the pretty pop tart who sings in Spanish and sounds like Alanis"; he compared the mix of musical elements in Fijación Oral, Vol. 1 to a Pop-Tart with a "rich and nutritious filling". Tom Townsend of Yahoo! Music called her "the greatest pop star we have", comparing her "consuming artistry" to that of Madonna and Prince. He credited the album for inspiring a revival of pop music, saying that the release proved that the genre "wasn't dead, just sleeping".Shakira's international success was solidified with Fijación Oral, Vol. 1's strong commercial performance. After it debuted at number 4 on the US Billboard 200 and became the highest-debuting full-length Spanish album in the country, her label Epic Records called her "the biggest female crossover artist in the world". The album is her third-highest-charting release in the nation, behind Laundry Service's peak position at number 3 and Shakira's number 2 peak. According to Billboard, it was the second best-selling Latin album of the decade in the US after Barrio Fino by Daddy Yankee.
answer:

Who compared the mix of musical elements with "a rich and nutritious filling"?