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.

[Q]: Passage: An Army-OSRD council on 25 June 1942 decided to build a pilot plant for plutonium production in Red Gate Woods southwest of Chicago. In July, Nichols arranged for a lease of 1,025 acres (415 ha) from the Cook County Forest Preserve District, and Captain James F. Grafton was appointed Chicago area engineer. It soon became apparent that the scale of operations was too great for the area, and it was decided to build the plant at Oak Ridge, and keep a research and testing facility in Chicago.Delays in establishing the plant in Red Gate Woods led Compton to authorize the Metallurgical Laboratory to construct the first nuclear reactor beneath the bleachers of Stagg Field at the University of Chicago. The reactor required an enormous amount of graphite blocks and uranium pellets. At the time, there was a limited source of pure uranium. Frank Spedding of Iowa State University were able to produce only two short tons of pure uranium. Additional three short tons of uranium metal was supplied by Westinghouse Lamp Plant which was produced in a rush with makeshift process. A large square balloon was constructed by Goodyear Tire to encase the reactor. On 2 December 1942, a team led by Enrico Fermi initiated the first artificial self-sustaining nuclear chain reaction in an experimental reactor known as Chicago Pile-1. The point at which a reaction becomes self-sustaining became known as "going critical". Compton reported the success to Conant in Washington, D.C., by a coded phone call, saying, "The Italian navigator [Fermi] has just landed in the new world."In January 1943, Grafton's successor, Major Arthur V. Peterson, ordered Chicago Pile-1 dismantled and reassembled at Red Gate Woods, as he regarded the operation of a reactor as too hazardous for a densely populated area. At the Argonne site, Chicago Pile-3, the first heavy water reactor, went critical on 15 May 1944. After the war, the operations that remained at Red Gate moved to the new site of the Argonne National Laboratory about 6 miles (9.7 km) away.
[A]: What is the full name of the person who replaced James?


[Q]: Passage: "Missing My Baby" is a mid-tempo R&B ballad with influences of urban and soul music. It is in the key of D major, at 144 beats per minute in common time. The recording incorporates melisma, with sung poetry during the downtempo part of the song. The melody is accompanied by backing vocals, and instrumentation is provided by an electric piano, drums, a keyboard, a synthesizer and strings. Contemporary music critics praised Selena's emotive enunciation, which emphasized the song's title and central theme. R&B duo Full Force were the backing vocalists for the original and remix versions of "Missing My Baby".J.R. Reynolds, formerly of Billboard, called "Missing My Baby" a "dreamy ballad" with an "R&B-styled melody under Selena's pop vocals". Ramiro Burr of the Austin American-Statesman described it as a soul ballad. Jerry Johnston of the Deseret News thought that Selena displayed a "Leslie Gore [sic] baby-voice" in "Missing My Baby" and that she "displays a wonderful suppleness in her voice". The Virginian-Pilot said that the song was built on hooks that recall Diana Ross's "Missing You", which is a tribute to Marvin Gaye, and the Beach Boys' "Good to My Baby".The song begins with a drum solo before the other instruments enter to form the musical foundation. Selena sings to her absent lover about how much she misses him, saying that he is "always on [her] mind" and that she feels lonely when he is not with her. Three times she sings, "I often think of the happy times we spent together / And I just can't wait to tell you that I love you". In the chorus, she sings of wanting to hold him tight and feel his heartbeat.
[A]: About whom is Selena singing of wanting to hold him tight and feel his heartbeat?


[Q]: Passage: A woman's dead body is shown in a cluster of lantana bushes. 
Leon, a police officer, and Jane, have sex in a motel room. They part ways, and Leon and his wife, Sonja, attend Latin dance classes that the recently separated Jane is also taking.
Leon does not enjoy the classes. He is seen savagely beating a drug dealer during a bust. He has emotional issues but refuses to confront or admit to them. Sonja sees a therapist, Valerie, who has just published a book on her own daughter's murder 18 months ago. She and her husband, John, are barely on speaking terms; he later refers to their marriage as held together by their grief. She feels threatened by another patient, Patrick Phelan, who is having an affair with a married man, which forces Valerie to confront her own issues in her marriage to John.
Hoping to see Leon again, Jane purposely bumps into him outside the police station, and they have sex again despite Leon's reservations. Nik is upset that she is seeing someone because he is friends with her estranged husband, Pete, who wants to return home. Jane pairs up with Sonja in the next salsa class, which angers Leon, who ends their arrangement, which upsets Jane. She invites Nik over for coffee at the behest of Paula, with whom she is friendly and offers him money as they are struggling. Paula now starts to dislike Jane.
Valerie is coming home late one night and drives off the road. She is stranded and makes several calls to John, who does not answer. Finally, she is seen approaching a car coming along the road but never makes it home. Leon is the investigating detective on the case and looks into her office and notes.  Surprised at seeing his wife's name and file, he takes an audio recording of their sessions.
[A]:
Whose disappearance is Leon investigating when he finds tapes of his wife's therapy sessions?