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.
Example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Example solution: Who believes Fagin's gang make wallets and handkerchiefs?.
Example explanation: This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.

Problem: Passage: Popeye & Olive Oyl stroll happily along arm-in-arm and stop short when Popeye catches sight of a roller rink: Good Skates 50 cents, Cheap Skates 25 cents the  declares. Asked to go skating, Olive protests that she does not know how; but Popeye will teach her! Within, the attendant asks Popeye what size of skates he wishes to rent, and Popeye, observing Olive's long feet, blushes, either not wishing to say or not knowing. "Make a fist," he suggests to his best girl, and the attendant shall measure it. ("A hand like a foot and a half," he mutters, deftly wrapping a skate about the lady's great clenched hand.) The long, long, slender skates procured, Popeye hammers them with his brawny fists to the bottom of Olive's shoes; she falls over a couple of times as Popeye delicately slips on his own. We roll over to the rink proper, and Popeye, swinging his arms as if rowing a canoe, a bit too gracefully demonstrates the proper technique; Olive attempts to move, but can only kick the air in desperation and flap her skinny arms as she falls headfirst into the railing around the rink. She frees her head by her own strength, but her feet, fanning out, become stuck in the same way as a result: with a struggle, one foot is freed, and an exasperated Olive is helped at last by Popeye, who gently releases the other foot and dusts off his indignant companion (adept enough to tap her foot impatiently), and he points out all of the other rinkgoers merrily whizzing about.
Solution: Who becomes stuck in the railing?