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].

Ex Input:
A British national held hostage in Yemen has been freed in a 'military intelligence' operation, according to Foreign Secretary Philip Hammond. The Briton, who has been identified as Robert Douglas Semple, 64, was released by United Arab Emirates forces. The freed hostage had been working as a petroleum engineer in the Yemeni province of Hadramawt when he was kidnapped in February 2014. The UAE forces were based in Yemen's main port city of Aden, according to the state news agency WAM. The Yemeni agency reported that he had been held by al-Qaeda for 18 months. Mr Semple was taken to the Yemeni port city of Aden before being flown to Abu Dhabi by military plane on Saturday night, it added.Hostage identified as petroleum engineer Robert DouglasSemple, 64He was abducted in February 2014 while working in Hadramawt provinceForeign Secretary Philip Hammond made the announcement from TehranAbductions are common in Yemen, plagued by tribesmen and Al-Qaeda militants 
 Question:Abductions are frequent as armed tribesmen and al-_-linked militants take hostages in the hope of swapping them for prisoners or cash.

Ex Output:
Qaeda


Ex Input:
Roger Federer set up a blockbuster rematch with world number one Novak Djokovic by beating Milos Raonic to reach the final of the BNP Paribas Open. Following Djokovic's comprehensive 6-2 6-3 victory over British No 1 Andy Murray, Federer reached his 40th ATP World Tour Masters 1000 final with a 7-5 6-4 defeat of Canadian sixth seed Raonic at Indian Wells. Sunday's showdown will be a 38th meeting between reigning champion Djokovic and world number two Federer, who is on a 19-set winning streak. Roger Federer celebrates after completing his 7-5 6-4 semi-final win over Canadian Milos Raonic The Swiss serves during the contest at Indian Well and will now play Novak Djokovic in Sunday's finalFederer beat Raonic 7-5 6-4 to reach final of BNP Paribas OpenSwiss will face the world No 1 Djokovic in Sunday's finalThe Serb had earlier beaten British No 1 Andy Murray 6-2 6-3 
 Question:The _ soon broke for a 6-5 lead and wrapped up the set.

Ex Output:
Swiss


Ex Input:
How a huge expanse of grassland with black sooty patches appeared in the middle of lush rainforests, has long baffled conservationists. While some experts have argued fires started by the indigenous Pemón people scorched areas of rainforest, others argue that the grassy landscape of the Gran Sabana appeared before humans lived there. Now researchers claim that while manmade fires shaped the landscape, the region was already becoming a savannah. The Gran Sabana is a grassy 'island' in the middle of lush rainforests measuring 4,180 square miles (10,820 square km) where Venezuela meets Guyana and Brazil. Valenti Rull led a team at the Institute of Earth Sciences Jaume Almera in Barcelona, Spain, which examined ancient pollen in lake sediments, New Scientist reported.Scientists from the Institute of Earth Sciences Jaume Almera in Barcelona examined ancient pollen in lake sediments in Gran SabanaSediment showed area in Venezuela was changing to savannah years before people first settled in the area around 12,000 years agoBut the savannah was expanded by fires, which may have been triggered by lightning strikes, or the Pemón people who still light thousands of firesSome experts believe their technique is the best way to manage and protect rainforests from rampant wildfires 
 Question:Dr Rodríguez interviewed a _ woman for her research who told her that without their practices, the region 'will become a huge fireball'.

Ex Output:

Pemón