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].

(CNN) Flanked by Iraqi forces of all stripes, Prime Minister Haider al-Abadi declared Mosul has been recaptured from ISIS. "From here, from the heart of the liberated and free Mosul, by the sacrifices of the Iraqis from all the provinces, we declare the great victory for all of Iraq and Iraqis," al-Abadi announced Monday. "This is a great celebration that crowned the victories of the fighters and the Iraqis over the last three years." The US-led coalition fighting ISIS, Combined Joint Task Force Operation Inherent Resolve, congratulated Iraqi security forces "on their remarkable progress against ISIS while making extraordinary efforts to safeguard civilian lives."The US-led coalition fighting ISIS congratulates Iraqi security forcesThere has been little progress in a deal on who will govern, a source says 
 Question:But al-_ has tried hard to brand the fight against ISIS as a national one, involving a range of ethno-religious groups fighting under one national Iraqi flag.
Abadi

She is the wife of a billionaire who is still top of the polls among Republican contenders for the White House. Last night Melania Trump went center stage as she accompanied her husband Donald at the party's debate in Colorado - and where despite a muted performance, he remained front-runner in the polls. To be in such a position would be unusual of itself. But, Daily Mail Online can disclose, it is extraordinary. For Melania Trump is also the daughter of a card-carrying Communist and was brought up in a Soviet-era apartment in a country which fell apart in a bloody frenzy of inter-ethnic violence.Melania Trump, 45, was born and raised in Sevnica, Slovenia to parents Viktor and Amalija KnavsDocument from the Slovenian State Archives that her father was a listed member of the League of CommunistsMelania and her sister Ines took part in fashion shows alongside the children of their parents' fellow factory workers'She would talk about becoming a model. It was her only dream,' said a former friend and classmateMelania met renowned fashion photographer Stane Jerko in 1987 at a modeling contestMarried Donald Trump in 2005 and they share one son, Barron, who is nine, and is Trump's fifth childSeen at Wednesday night's presidential debate as her husband remains front-runner in Republican pollsSee our full coverage on Donald Trump, his wife Melania and his Presidential campaign 
 Question:'_ and I always sat next to each other in school.
Melania Trump

It may look like a run-of-the mill paddock, but beneath the surface lies a breath-taking phenomenon. Situated 450 km southeast of Adelaide is Mount Gambier, one of the few places in the world with the water conditions and soft limestone bedrock that give rise to spectacular underground sinkholes. Stunning images show specialist divers exploring otherworldly sites such as the 65 metre deep Kilsby’s Sinkhole and the 120 metre deep Shaft, which lie below seemingly mundane farms and paddocks. The caverns are the epicentre of The Cave Divers Association of Australia, who navigate the sites in the name of science. ‘Most people are drawn to the sport for the challenge and exploration, but they become passionate about the scientific elements afterwards,’ said John Vanderleest, the national director of the Cave Divers Association of Australia.Mount Gambier is one of the few cities in the world with the right conditions for underground sinkholesIt features spectacular sites like Kilsby’s Sinkhole and the The Shaft, which are found below paddocksThe caverns are among 30 identified cave sites used by the The Cave Divers Association of AustraliaCave diving involves rigorous training to explore elusive caves using specified gear and equiptment 
 Question:_ use scuba gear and harnesses to traverse the caverns and unearth marine life and geographic discoveries.

The Cave Divers Association of Australia

