You need to read the given passage and construct a question about the information present in the passage. The question should be answerable from the passage. Most importantly, only those questions are allowed whose answers cannot be determined from a single sentence. Do not generate questions that require only a single sentence to answer. Instead, try to combine two sentences and create a question from that combination. Do not create open-ended questions, i.e., the answers to them cannot be found precisely from the information provided in the passage.

Paragraph- Sent 1: Billy and Sally are brother and sister.
Sent 2: Billy is seven and Sally is eight.
Sent 3: Their mother, Deborah, likes to have Billy and Sally dress up in costumes and play a game where they are answering the telephone.
Sent 4: Usually when they play the game, Billy answers the telephone in a loud voice, and Sally answers the telephone in a quiet voice.
Sent 5: On Tuesdays, Billy answers in a quiet voice, and Sally answers in a loud voice.
Sent 6: On Fridays, Billy answers in a loud voice and Sally in a quiet voice.
Sent 7: \tabBilly has blonde hair.
Sent 8: Sally has brown hair.
Sent 9: Deborah has blonde hair, and Billy and Sally's father, Bob, has brown hair.
Sent 10: He tells them to eat lettuce every time that he sees them, so that they grow big and strong like he is.
Sent 11: Deborah likes to add some sugar with the lettuce so that Billy and Sally know what it is like to have sweet tastes in their life.
Sent 12: One day, a Wednesday, Billy throws some lettuce into Sally's hair.
Sent 13: Deborah laughs an grabs some straw from their farm and puts it in Billy's hair.
Sent 14: Billy and Sally live on a farm.
Sent 15: They have a goat, named Joey, and a duck, named Quack.
Sent 16: They sometimes play a game with the goat where they chase him around the farm.
Sent 17: Other times, they play a game with Quack where they wave at Quack and laugh.
Sent 18: They have a fun life growing up on the farm.
Who are Billy and Sally's parents?

Paragraph- Sent 1: Born on May 11, 1975, in Mazraa, Lebanon, Ziad Jarrah came from an affluent family and attended private, Christian schools.
Sent 2: Like Atta, Binalshibh, and Shehhi, Jarrah aspired to pursue higher education in Germany.
Sent 3: In April 1996, he and a cousin enrolled at a junior college in Greifswald, in northeastern Germany.
Sent 4: There Jarrah met and became intimate with Aysel Senguen, the daughter of Turkish immigrants, who was preparing to study dentistry.
Sent 5: Even with the benefit of hindsight, Jarrah hardly seems a likely candidate for becoming an Islamic extremist.
Sent 6: Far from displaying radical beliefs when he first moved to Germany, he arrived with a reputation for knowing where to find the best discos and beaches in Beirut, and in Greifswald was known to enjoy student parties and drinking beer.
Sent 7: Although he continued to share an apartment in Greifswald with his cousin, Jarrah was mostly at Senguen's apartment.
Sent 8: Witnesses interviewed by German authorities after 9/11, however, recall that Jarrah started showing signs of radicalization as early as the end of 1996.
Sent 9: After returning from a trip home to Lebanon, Jarrah started living more strictly according to the Koran.
Sent 10: He read brochures in Arabic about jihad, held forth to friends on the subject of holy war, and professed disaffection with his previous life and a desire not to leave the world "in a natural way."Sent 11: In September 1997, Jarrah abruptly switched his intended course of study from dentistry to aircraft engineering-at the Technical University of Hamburg-Harburg.
Sent 12: His motivation for this decision remains unclear.
Sent 13: The rationale he expressed to Senguen-that he had been interested in aviation since playing with toy airplanes as a child-rings somewhat hollow.
Sent 14: In any event, Jarrah appears already to have had Hamburg contacts by this time, some of whom may have played a role in steering him toward Islamic extremism.
Sent 15: Following his move to Hamburg that fall, he began visiting Senguen in Greifswald on weekends, until she moved to the German city of Bochum one year later to enroll in dental school.
Sent 16: Around the same time, he began speaking increasingly about religion, and his visits to Senguen became less and less frequent.
Sent 17: He began criticizing her for not being religious enough and for dressing too provocatively.
Sent 18: He grew a full beard and started praying regularly.
In what ways does the story make Ziad seem to be a normal college student?

Paragraph- Sent 1: On 9/11, the defense of U.S. airspace depended on close interaction between two federal agencies: the FAA and the North American Aerospace Defense Command (NORAD).
Sent 2: The most recent hijacking that involved U.S. air traffic controllers, FAA management, and military coordination had occurred in 1993.90 In order to understand how the two agencies interacted eight years later, we will review their missions, command and control structures, and working relationship on the morning of 9/11.
Sent 3: FAA Mission and Structure.
Sent 4: As of September 11, 2001, the FAA was mandated by law to regulate the safety and security of civil aviation.
Sent 5: From an air traffic controller's perspective, that meant maintaining a safe distance between airborne aircraft.
Sent 6: Many controllers work at the FAA's 22 Air Route Traffic Control Centers.
Sent 7: They are grouped under regional offices and coordinate closely with the national Air Traffic Control System Command Center, located in Herndon, Virginia, which oversees daily traffic flow within the entire airspace system.
Sent 8: FAA headquarters is ultimately responsible for the management of the National Airspace System.
Sent 9: The Operations Center located at FAA headquarters receives notifications of incidents, including accidents and hijackings.
Sent 10: FAA Control Centers often receive information and make operational decisions independently of one another.
Sent 11: On 9/11, the four hijacked aircraft were monitored mainly by the centers in Boston, New York, Cleveland, and Indianapolis.
Sent 12: Each center thus had part of the knowledge of what was going on across the system.
Sent 13: What Boston knew was not necessarily known by centers in New York, Cleveland, or Indianapolis, or for that matter by the Command Center in Herndon or by FAA headquarters in Washington.
Sent 14: Controllers track airliners such as the four aircraft hijacked on 9/11 primarily by watching the data from a signal emitted by each aircraft's transponder equipment.
Sent 15: Those four planes, like all aircraft traveling above 10,000 feet, were required to emit a unique transponder signal while in flight.
Sent 16: On 9/11, the terrorists turned off the transponders on three of the four hijacked aircraft.
Sent 17: With its transponder off, it is possible, though more difficult, to track an aircraft by its primary radar returns.
Sent 18: But unlike transponder data, primary radar returns do not show the aircraft's identity and altitude.

Where is the Air Traffic Control System located at and who is ultimately responsible for the Airspace system?

