TASK DEFINITION: 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.
PROBLEM: Passage: Princess Anne plans to run away with Freddie Granton, the commoner secretary of her father, King Eric VIII, once her domineering mother, Queen Martha, has left for a vacation in America. Anne is therefore aghast when the Marquis of Birten brings news that he has negotiated her political marriage to Prince William of Grec, a man she has never even met. Dismissing Anne's vehement protests, the Queen is delighted, a feeling not shared by Anne's loving but ineffectual father.
Meanwhile, the Premier and General Northrup warn that a revolution is brewing. He wishes to execute large numbers of political prisoners, but cannot without the King's signature. The Queen wholeheartedly approves of these stern measures. The King promises to attend to it, but after Northrup and the Queen leave, he orders his secretary to misplace the death warrants. Led by Laker, the rebels rise up after Northrup gets Parliament to grant him dictatorial powers. Anne seizes the opportunity to try to flee with Granton, with her father's approval. However, when she believes that the King is in real danger, she refuses to leave him.
Doctor Fellman, a moderate rebel leader, comes to see the King to demand his abdication, but agrees to stop the fighting in favor of negotiation. Then Northrup insists he is in charge now and laughs in derision when the King claims the people are stronger than Northrup's army and navy. Next to arrive is Prince William. Despite his admission that he dislikes Anne, he is prepared to do his duty and go through with the wedding. Then Fellman and Laker show up. The King surprises Northrup by dismissing him from his service and putting Fellman in charge, ordering him to set up general elections as soon as possible.

SOLUTION: What is the title of the person who is to be married to Prince William of Grec?

PROBLEM: 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.

SOLUTION: Who worked for Juan?

PROBLEM: Passage: Telephone services are widely available, and a central digital trunk line connects most regions. Vivacom (BTC) serves more than 90% of fixed lines and is one of the three operators providing mobile services, along with A1 and Telenor. Internet penetration stood at 61.9% of the population aged 16–74, in 2017.Bulgaria's strategic geographic location and well-developed energy sector make it a key European energy centre despite its lack of significant fossil fuel deposits. Thermal power plants generate 48.9% of electricity, followed by nuclear power from the Kozloduy reactors (34.8%) and renewable sources (16.3%). Equipment for a second nuclear power station at Belene has been acquired, but the fate of the project remains uncertain. Installed capacity amounts to 12,668 MW, allowing Bulgaria to exceed domestic demand and export energy.The national road network has a total length of 19,512 kilometres (12,124 mi), of which 19,235 kilometres (11,952 mi) are paved. Railroads are a major mode of freight transportation, although highways carry a progressively larger share of freight. Bulgaria has 6,238 kilometres (3,876 mi) of railway track and currently a total of 81 kilometres (50 miles) of high-speed lines are in operation. Rail links are available with Romania, Turkey, Greece, and Serbia, and express trains serve direct routes to Kiev, Minsk, Moscow and Saint Petersburg. Sofia and Plovdiv are the country's air travel hubs, while Varna and Burgas are the principal maritime trade ports.

SOLUTION:
What is the name of the country whose air travel hubs are Sofia and Plovdiv?