In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

Q: A fed-up Florida high school teacher was suspended without pay on Tuesday for five days for using a cell phone jammer to block students' cell phone service at school. Dean Liptak, a former wrestler turned science teacher at Fivay High School, wanted to stop his students from using their cell phones during classes. Liptak took matters into his own hands by secretly taking the disruptive device to school and activating it in his classroom from March 31 to April 2. 'I wanted to fix the cell phone problem in my class,' Liptak told a district investigator. The Tampa Bay Times reports that Liptak said he never wanted to cause problems and that he thought jammers were permitted.Dean Liptak, a former wrestler turned science teacher at Fivay High School, wanted to stop his students from using their cell phones during classesLiptak was suspended for five days without pay after the school discovered he secretly brought a cell phone jammer to school to disrupt serviceDistrict officials feared the jammer would also interfere with both teachers and students trying to make a 911 call in the case of an emergency 
 Question:'Not only did your actions potentially violate federal law, you posed a serious risk to critical safety communications as well as the possibility of preventing others from making 9-1-1 calls,' Superintendent Kurt Browning wrote in a letter to _.

A: Dean Liptak
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Q: The gunman who killed nine people last week at an Oregon college shot himself in front of his classmates after being wounded by two hero cops. Also revealed on Wednesday was that Umpqua Community College shooter Christopher Harper-Mercer, 26, was discharged from the Army after attempting to commit suicide. Harper-Mercer was discharged after one month of basic training at Fort Jackson, in South Carolina, in 2008. The Wall Street Journal reports that the Army wouldn't disclose details of the 2008 suicide attempt but that it indicates Harper-Mercer was deeply troubled long before he opened fire on his classmates last Thursday.Christopher Harper-Mercer, 26, shot himself in a classroom after being wounded by two hero cops who opened fireHarper-Mercer was discharged from the Army in 2008 for trying to commit suicideTodd Spingath was one of two officers to take down Oregon shooterHis partner and fellow vet, Joe Kaney, was identified earlier this weekThe pair have been hailed for preventing further potential devastationThey rushed into Umpqua Community College five minutes after alert 
 Question:At a Wednesday news conference, authorities said that two police officers in plainclothes were the first to confront Harper-_ after he began shooting at his morning writing class.

A: Mercer
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Q: (CNN) -- A former security guard told CNN on Monday that he was unjustly fired after he took pictures of President Barack Obama's motorcade during a visit to Atlanta in September. Kenneth Tate worked for a private security firm when President Obama visited the Centers for Disease Control and Prevention on September 16. He told CNN's Brooke Baldwin in an exclusive television interview that he stuck to his assigned duties and tried to take photos after he was done escorting President Obama. Members of Congress were upset when the media reported last month that Tate had a .40-caliber handgun while in an elevator with the President. That report, coupled with news of an incident in which a man jumped a fence and made it into the White House, led to the resignation of Secret Service Director Julia Pierson.Fired security guard tells CNN he stuck to his assigned dutiesKenneth Tate only went to take pictures when the detail was over, he saysFederal official says CDC asked for Tate to be reassignedTate says he carried a handgun that he was given, never took photos of President on elevator 
 Question:Tate said he was supposed to take the President to two different floors of one of the _ buildings.

A:
Centers for Disease Control and Prevention
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