You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "who is going to host the world cup 2018?" whose answer is Russia.
Each document should contain about 30 words, and these documents should contain useful information.

Query: world cup 2018 host
Useful Output:

Doc 1: Back in 2018, of course, it was Russia who hosted the tournament. Russia used 12 stadiums, with the 78,000-capacity Luzhniki Stadium the venue
Doc 2: The 2018 FIFA World Cup is being held in cities throughout Russia from June 14 through July 15. Teams are competing at 12 stadiums in 11 different cities.
Doc 3: World Cup 2018: A guide to the grounds hosting games in Russia · Luzhniki Stadium, Moscow · Spartak Stadium, Moscow · Nizhny Novgorod Stadium,
Doc 4: Host: Russia Teams: 32. Format: Group stage, knockouts. Matches: 64. Goals: 169. Winner: France Runners-up: Croatia
Doc 5: In many ways, Russia was the perfect World Cup host. A vast country where there is so much to uncover. The organisation was superb, thanks in no