In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

West Des Moines, Iowa (CNN) Donald Trump had every reason to feel optimistic Monday. His poll numbers were up; he had secured two prominent endorsements in the space of a week; and even the weather seemed to be cooperating, with a snowstorm coming in from the west expected to hold off until after midnight. Sarah Palin endorses Donald Trump And then, he lost, coming in second to Ted Cruz. Trump spent January in full-on attack mode against Cruz. Trump questioned whether Cruz qualifies as a "natural-born citizen" eligible to serve as president. He went after the evangelical vote, winning the endorsement of Liberty University President Jerry Falwell, Jr., but didn't back up the appeals with a ground game. And then he sat out the final debate, opting for a rally across town at the same time.Donald Trump finished second in the Iowa caucuses on Monday nightHe sat out the final debate in Iowa and he acknowledged Tuesday that his plan might have backfired
With _'s win and Marco Rubio's much stronger-than-expected finish Monday night, Trump now urgently confronts the danger of the Florida senator chipping away at his establishment backing in upcoming contests.

Concerns are growing over Russian ships that have docked in a once-secret naval base in the Arctic. Military leaders in Norway are nervous about its powerful neighbour's presence on its 'strategically important' coastline following a spike in tensions between Russia and NATO nations. Some experts have criticised the shutting down of Olavsvern Naval Base - a huge complex buried in mountainous terrain near the town of Tromsoe - which has been closed since 2009. But fears have once again peaked after three Russian ships spent the entire winter docked deep within the mountain hideaway which was once a heavily guarded military facility.Three Russian ships that docked in Olavsvern Naval Base for the entire winterBase which was shut down in 2009 is nestled deep inside mountainous regionNorway's military fears Russian presence on 'strategically important' coastline
A former second in command for the Norwegian military said: '_ is a country where the state has a say over all commercial or semi-state business.

(CNN) -- As the Curiosity rover begins its exciting trek across the surface of Mars and up the dramatic peak of Mt. Sharp it is important to realize that the plans for this great success were incubated and acted upon more than 10 years ago. Exploration like this is not for the faint of heart -- it takes time and persistence. So what's next? What is in the funded pipeline now that will be revolutionizing our understanding of life in the solar system 10 or even 20 years from now? The short answer is -- nothing. Curiosity is it. After Curiosity there is, at present, no other mission in production that will explore potentially habitable worlds beyond Earth.Moons Europa, Enceladus, and Titan are covered with solid water iceScientist Kevin Peter Hand says there could be vast liquid water oceans underneath the iceThese oceans could be great homes for alien ecosystems, says HandExploring Earth's oceans might help us understand fundamental geological and biological cycles

In addition, _ and the Earth are so close that asteroid impacts in the past might have seeded either world with life from the other.