Problem: One wave of the population boom ended abruptly in the mid-1980s, as oil prices fell precipitously. The space industry also suffered in 1986 after the Space Shuttle Challenger disintegrated shortly after launch. There was a cutback in some activities for a period. In the late 1980s, the city's economy suffered from the nationwide recession. After the early 1990s recession, Houston made efforts to diversify its economy by focusing on aerospace and health care/biotechnology, and reduced its dependence on the petroleum industry. Since the increase of oil prices in the 2000s, the petroleum industry has again increased its share of the local economy.
What caused population growth to decline  in the 1980s?
The answer is the following: oil prices fell

Problem: Bill & Melinda Gates Foundation (or the Gates Foundation, abbreviated as BMGF) is the largest private foundation in the world, founded by Bill and Melinda Gates. It was launched in 2000 and is said to be the largest transparently operated private foundation in the world. The primary aims of the foundation are, globally, to enhance healthcare and reduce extreme poverty, and in America, to expand educational opportunities and access to information technology. The foundation, based in Seattle, Washington, is controlled by its three trustees: Bill Gates, Melinda Gates and Warren Buffett. Other principal officers include Co-Chair William H. Gates, Sr. and Chief Executive Officer Susan Desmond-Hellmann.
What is the largest private foundation in the world?
The answer is the following: Bill & Melinda Gates Foundation (or the Gates Foundation, abbreviated as BMGF) is the largest private foundation in the world

Problem: On release, Twilight Princess was considered to be the greatest Zelda game ever made by many critics including writers for 1UP.com, Computer and Video Games, Electronic Gaming Monthly, Game Informer, GamesRadar, IGN and The Washington Post. Game Informer called it "so creative that it rivals the best that Hollywood has to offer". GamesRadar praised Twilight Princess as "a game that deserves nothing but the absolute highest recommendation". Cubed3 hailed Twilight Princess as "the single greatest videogame experience". Twilight Princess's graphics were praised for the art style and animation, although the game was designed for the GameCube, which is technically lacking compared to the next generation consoles. Both IGN and GameSpy pointed out the existence of blurry textures and low-resolution characters. Despite these complaints, Computer and Video Games felt the game's atmosphere was superior to that of any previous Zelda game, and regarded Twilight Princess's Hyrule as the best version ever created. PALGN praised the game's cinematics, noting that "the cutscenes are the best ever in Zelda games". Regarding the Wii version, GameSpot's Jeff Gerstmann said the Wii controls felt "tacked-on", although 1UP.com said the remote-swinging sword attacks were "the most impressive in the entire series". Gaming Nexus considered Twilight Princess's soundtrack to be the best of this generation, though IGN criticized its MIDI-formatted songs for lacking "the punch and crispness" of their orchestrated counterparts. Hyper's Javier Glickman commended the game for its "very long quests, superb Wii controls and being able to save anytime". However, he criticised it for "no voice acting, no orchestral score and slightly outdated graphics".
Which game publication does Jeff Gerstmann work for?
The answer is the following: GameSpot

Problem: A few years after its foundation, Montevideo became the main city of the region north of the Río de la Plata and east of the Uruguay River, competing with Buenos Aires for dominance in maritime commerce. The importance of Montevideo as the main port of the Viceroyalty of the Río de la Plata brought it in confrontations with the city of Buenos Aires in various occasions, including several times when it was taken over to be used as a base to defend the eastern province of the Viceroyalty from Portuguese incursions.
The importance of Montevideo as the main port of the Viceroyalty of the Rio de la Plata brought confrontations with what city?
The answer is the following:
Buenos Aires