Question: The largest opera houses of Paris are the 19th-century Opéra Garnier (historical Paris Opéra) and modern Opéra Bastille; the former tends toward the more classic ballets and operas, and the latter provides a mixed repertoire of classic and modern. In middle of the 19th century, there were three other active and competing opera houses: the Opéra-Comique (which still exists), Théâtre-Italien, and Théâtre Lyrique (which in modern times changed its profile and name to Théâtre de la Ville). Philharmonie de Paris, the modern symphonic concert hall of Paris, opened in January 2015. Another musical landmark is the Théâtre des Champs-Élysées, where the first performances of Diaghilev's Ballets Russes took place in 1913.
Is there an answer to this question: What are the two largest opera houses in Paris?

Answer: Opéra Garnier (historical Paris Opéra) and modern Opéra Bastille;


Question: The evolution of the Greek economy during the 19th century (a period that transformed a large part of the world because of the Industrial Revolution) has been little researched. Recent research from 2006 examines the gradual development of industry and further development of shipping in a predominantly agricultural economy, calculating an average rate of per capita GDP growth between 1833 and 1911 that was only slightly lower than that of the other Western European nations. Industrial activity, (including heavy industry like shipbuilding) was evident, mainly in Ermoupolis and Piraeus. Nonetheless, Greece faced economic hardships and defaulted on its external loans in 1826, 1843, 1860 and 1894.
Is there an answer to this question: What was Greece's GDP decline between 1833 and 1911 compared with other Western European nations?

Answer: unanswerable


Question: From the early Qing, the central government was characterized by a system of dual appointments by which each position in the central government had a Manchu and a Han Chinese assigned to it. The Han Chinese appointee was required to do the substantive work and the Manchu to ensure Han loyalty to Qing rule. The distinction between Han Chinese and Manchus extended to their court costumes. During the Qianlong Emperor's reign, for example, members of his family were distinguished by garments with a small circular emblem on the back, whereas Han officials wore clothing with a square emblem.
Is there an answer to this question: What shape of emblam signified members of the royal family?

Answer: circular


Question: Managers in the Premier League are involved in the day-to-day running of the team, including the training, team selection, and player acquisition. Their influence varies from club-to-club and is related to the ownership of the club and the relationship of the manager with fans. Managers are required to have a UEFA Pro Licence which is the final coaching qualification available, and follows the completion of the UEFA 'B' and 'A' Licences. The UEFA Pro Licence is required by every person who wishes to manage a club in the Premier League on a permanent basis (i.e. more than 12 weeks – the amount of time an unqualified caretaker manager is allowed to take control). Caretaker appointments are managers that fill the gap between a managerial departure and a new appointment. Several caretaker managers have gone on to secure a permanent managerial post after performing well as a caretaker; examples include Paul Hart at Portsmouth and David Pleat at Tottenham Hotspur.
Is there an answer to this question: Is this licence required on a permanent basis?

Answer:
The UEFA Pro Licence is required by every person who wishes to manage a club in the Premier League on a permanent basis