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].
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Question: (CNN) The Marine Corps' fighting ability is undermined by the more than 30,000 active Marines and veterans involved in a private Facebook group being investigated for allegedly posting explicit photos of women in the military without their consent, a former Navy secretary told CNN on Friday. "There's no good excuse," Ray Mabus said on CNN's New Day. "The Marine motto is 'semper fidelis,' always faithful, and what these Marines did was to be unfaithful to their fellow Marines." "Marines look after each other, Marines have each other's back. Look at what the commandant of the Marine Corps said about this, this makes us a less effective fighting force," Mabus said, referring to a video statement posted Tuesday by Gen. Robert Neller.Ray Mabus: "What these Marines did was to be unfaithful to their fellow Marines"Investigation should determine how "Marines United" group developed, he said 
 Question:"These Marines, these veterans, that have participated in this have attacked fellow Marines, and that is inexcusable in a fighting force, and particularly in the _, who are so special."

Answer: Marines


Question: (CNN) Your "BPA-free" plastic product may be no safer than the product it replaced, says a new UCLA study that analyzed the impact of a common BPA alternative on zebra fish embryos. The study joins a small but growing group of similar research sounding the alarm about so called "BPA-free" alternatives. "Our findings are frightening and important," said senior author and reproductive endocrinologist Nancy Wayne. "Consider it the aquatic version of the canary in the coal mine." After decades of animal research linked BPA (Bisphenol A), a known endocrine disruptor, to problems with brain and reproductive development, early puberty and a rise in breast and prostate cancer, many manufacturers stopped using the chemical to harden plastics, replacing it with "BPA-free" alternatives. The most common replacement is BPS (Bisphenol S), said Wayne.BPA-free alternatives may be no safer than BPA, say researchersMost common alternative, BPS, linked in study to disruptions of estrogen and thyroid hormones 
 Question:In addition to the effect on estrogen, the study also found both _ and BPS affected the thyroid hormone system.

Answer: BPA


Question: London (CNN) British astronaut Tim Peake provided the countdown for the 36th London Marathon Sunday before running his own virtual version of the race on a treadmill hundreds of miles above the Earth. A recorded message in which Peake wished the competitors luck was played on big screens before the runners set off in London and the 44-year-old astronaut began his own run on board the International Space Station. Kenyan long-distance runner Eliud Kipchoge won the men's race, in a course record time of two hours, three minutes and four seconds to triumph at the event for the second year in a row.UK astronaut Tim Peake runs 'virtual' London Marathon on a treadmill in orbitKenya's Eliud Kipchoge and Jemima Sumgong take titlesKipchoge just outside men's world recordThe millionth runner in the event's history will cross the finish line 
 Question:The video was populated with avatars depicting actual _ runners who are using the Run Social app as they race.

Answer:
London