instruction:
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].
question:
(CNN) Khuram Shahzad Butt, a 27-year-old British national born in Pakistan who died in a hail of police bullets Saturday night after the London attack, was a tall, lanky, straggly bearded young man of few words -- a brainwashed follower of al-Muhajiroun, a loose grouping of British extremists supportive of ISIS linked to a large number of terrorist plots involving UK nationals. The latest on London attack CNN's Sandi Sidhu met him several times while reporting on the group in the United Kingdom between 2014 and 2016. He went by the name "Abz" or "Abu Zaitun" and seldom spoke during meetings. He was content to leave the task of proselytizing to louder, older members of the group, according to Sidhu.London attacker Khuram Shahzad Butt appeared in a 2016 Channel 4 documentary called "The Jihadis Next Door"At the time of the attack, Butt worked as a receptionist at a fitness center in Ilford, a friend from the gym said 
 Question:The identification of Butt as one of the attackers raised many questions about what _ authorities knew about him and when.
answer:
British


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(CNN) In 2004, Mostafa Salameh had a vivid dream: he was praying for peace on the top of a mountain. "I woke up sweating and I saw myself on top of the world," Salameh tells CNN. Back then, Salameh had no expedition experience, little money and couldn't have pointed to Mount Everest on a map. Fast forward to 2017, and he has become the first Jordanian to complete the "Explorers Grand Slam," which entails climbing the Seven Summits, including Mount Everest, and reaching the North and South poles. Only 15 other people have ever achieved the Grand Slam. His amazing life has now become the subject of an international book, published by Bloomsbury and endorsed by King Abdullah II of Jordan and British adventurer Ranulph Fiennes.Mostafa Salameh has become the first Jordanian to climb the Seven Summits, and trek to both the North and South polesHe has released a book "Dreams of a Refugee: From the Middle East to Mount Everest" detailing his adventures 
 Question:Almost immediately afterward, Salameh stopped partying, smoking and began training for the _.
answer:
Explorers Grand Slam


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Tokyo (CNN) Another presumed North Korean vessel has washed up on Japan's shores, bringing the total to a record 83 for the year so far. Akita prefectural police said that a wooden boat washed ashore in Katagami City on Tuesday afternoon, the second boat discovered on Japanese shores that day. The following day, police and coast guard officials investigating the vessel found two partially decomposed bodies inside, one of which was wearing a badge with a portrait of former North Korean leader Kim Jong Il on his clothes. Also on Wednesday, a corpse with a piece of paper bearing Korean characters in its pocket, was found on shore in nearby Akita City.North Korean vessel washes up on Japanese shoresLatest incident shines a light onto conditions in the country 
 Question:Nov 28: A _ fishing boat with 10 crew members was found drifting near an uninhabited island off Matsumae, Hokkaido.
answer:

North Korean


