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].

Seoul, South Korea (CNN) -- North Korea on Monday fired more projectiles into the sea off its east coast, South Korean officials said, urging Pyongyang to refrain from "tension-creating acts." But Pyongyang described the launches as a "regular military exercise." The South Korean Defense Ministry still needs to analyze exactly what the North has been firing for the past three days, said Choi Yong-su, an official in the ministry representative's office. They could be short-range missiles or a new kind of large-caliber artillery rocket, the ministry said. The North fired three projectiles into waters off its east coast Saturday and a fourth Sunday. It fired two more Monday, Choi said.North Korea says the launches are a "regular military exercise"North Korea has fired six projectiles into the sea over the past three days, Seoul saysThe South says they could be short-range missiles or large-scale artilleryThe North last week criticized the presence of a U.S. aircraft carrier in the region 
 Question:Before last week, tensions in the region had eased from a period in March and April that included near daily _ threats of war against South Korea and the United States.
North Korea

(CNN) -- Asiana Airlines Flight 214 was seconds away from landing when the passengers sensed something horribly amiss. The plane was approaching San Francisco International Airport under a beautifully clear sky, but it was flying low. Dangerously low. Benjamin Levy looked out the window from seat 30K and said he could see the water of the San Francisco Bay about 10 feet below. Even for an airport where landing strips run close to the water, the descent seemed alarming to the San Francisco man. "I don't see any runway, I just see water," Levy recalled. Further back in the Boeing 777, Xu Das had the same realization.Flight recorders have been found, the NTSB saysAsiana identifies the two 16-year-old girls killed in the crash182 people were hospitalized, while 123 were uninjuredPassengers say the plane's rear struck the edge of the runway 
 Question:Perhaps one of the reasons so many people survived Saturday's crash was because the _ is built so that everybody can get off the plane within 90 seconds, even if half the doors are inoperable.
Boeing 777

According to some accounts, the wealth of the ancient Roman empire was reflected in the very fabric of the city - with buildings of sparkling white marble at its centre. Even the founder of the Roman empire, Emperor Augustus claimed that he had 'found Rome a city of bricks and left it a city of marble'. But new research by historians at the University of California Los Angeles has now cast doubt on this boast. Scroll down to explore ancient Rome in 3D This reconstruction by historians at the University of California shows how Rome would have looked under the rule of Augustus and reveals that many of the buildings were made from brick (shown in grey) while only a few temples were constructed from marble (pink)Emperor Augustus boasted about how his rule left Rome 'a city of marble' while historical accounts said it glitteredHistorians at the University of California Los Angeles have reconstructed ancient Rome using architectural softwareThey found that most of the buildings were built mainly from brick and only a few temples were made from marbleThose that were made from marble would have been difficult to see from many parts of the city, say the researchers 
 Question:'I wanted to see if _ literally transformed under his rule.

Rome