Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following 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.
Solution: Who believes Fagin's gang make wallets and handkerchiefs?.
Reason: 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.

Now, solve this instance: Passage: After their flight is cancelled due to stormy weather, neurosurgeon Dr. Ben Bass and photojournalist Alex Martin hire private pilot Walter to get them to Denver for connecting flights to Alex's wedding in New York and Ben's emergency surgery appointment in Baltimore. Walter, who has not filed a flight plan, suffers a fatal stroke mid-flight, and the plane crashes on a mountaintop in the High Uintas Wilderness. Ben, Alex, and Walter's dog survive the crash with various injuries.
Alex thinks Ben has a better chance of finding help if he leaves her behind, but Ben refuses. Stranded for days with dwindling supplies, Alex grows skeptical that they will be rescued, although Ben wants to wait for help by the plane's wreckage. After arguing, Alex starts a lone descent down the mountain. Ben catches up and they make-up over past grievances. 
Alex falls into freezing water near an abandoned cabin. They stay there for several days while Alex recuperates, and they have sex. Ben reveals that his wife died two years prior from a brain tumor. As Ben sleeps, Alex takes his picture. Later, she again asks Ben to leave her behind to find help. Ben initially agrees but soon returns; they press forward again. 
The dog alerts them to a nearby timber yard. On their way toward it, Ben's leg gets caught in a bear trap. Alex cannot free him, but she reaches the yard and collapses in front of an approaching truck. Ben awakens in a hospital and goes to Alex's room, where he finds her with Mark, her fiancé. After a brief discussion, Ben leaves heartbroken. Some time after, Mark discovers Alex is no longer in love with him.
Student:
What are the full names of the people that the dog alerts about a nearby timber yard?