In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

Passage: Curiously, it appears that the Greeks did not "breed" their slaves, at least during the Classical Era, though the proportion of houseborn slaves appears to have been rather large in Ptolemaic Egypt and in manumission inscriptions at Delphi. Sometimes the cause of this was natural; mines, for instance, were exclusively a male domain. On the other hand, there were many female domestic slaves. The example of African slaves in the American South on the other hand demonstrates that slave populations can multiply.Xenophon advised that male and female slaves should be lodged separately, that "…nor children born and bred by our domestics without our knowledge and consent—no unimportant matter, since, if the act of rearing children tends to make good servants still more loyally disposed, cohabiting but sharpens ingenuity for mischief in the bad." The explanation is perhaps economic; even a skilled slave was cheap, so it may have been cheaper to purchase a slave than to raise one. Additionally, childbirth placed the slave-mother's life at risk, and the baby was not guaranteed to survive to adulthood.Houseborn slaves (oikogeneis) often constituted a privileged class. They were, for example, entrusted to take the children to school; they were "pedagogues" in the first sense of the term. Some of them were the offspring of the master of the house, but in most cities, notably Athens, a child inherited the status of its mother. 
Question: What were entrusted to take children to school?
oikogeneis.

Passage: Richie Donovan works as a professional thief for Groznyi, a wealthy businessman, to pay off his debt for being smuggled into the U.S. as a child. He pulls off an initially successful diamond heist, but it is botched when he is involved in two separate car accidents. He is given one last chance to pay off his debt by going to Russia to steal a priceless antique cross, locked in a safe in a Moscow penthouse apartment. Richie and his Russian accomplices, brothers Peter and Yuri, recover the cross; but their elevator becomes stuck on the uncompleted 13th floor. Believing the police have stopped the elevator, the thieves take their fellow passengers hostage to negotiate an escape. They agree to send one hostage down; but, when the elevator doors open on the ground floor, the hostage has mysteriously been beheaded. 
The remaining hostages quickly divide into two groups: a Christian group consisting of Sonya, Helena and Katerina, who are later joined by Yuri, and another group consisting of nerdy Dmitry, beautiful Anna, and incompetent security guard Boris.
In the confusion, the Christian group seizes firearms and takes control, shooting Peter. Katerina is sent to stand guard over Richie and the remainder of the hostages, while Sonya takes Yuri to a chamber where he is to sacrificed by a wild man in armor named Alex. Yuri escapes, but he is impaled by one of Alex's traps, complete with disco music and lighting. In his rage, Alex kills Katerina, allowing Richie and the hostages to escape. They discover Alex's lair, where he has been watching everyone using security cameras. A photo reveals that Alex is the twin brother of Sonya, and they both believe themselves to be descendants of Ivan the Terrible. The group splits when Richie and Anna decide to chase after Alex, while Boris and Dmitry prefer to rig the room with various traps they have constructed and wait for Alex to come to them. 
Question: Who are the people who think the authorities are responsible for the elevator stopping, leading them to take hostages?
Richie.

Passage: On 2 March 1714 Bach was appointed Konzertmeister (concert master) of the Weimar Hofkapelle (court chapel) of the co-reigning dukes Wilhelm Ernst and Ernst August of Saxe-Weimar. The position was created for him, possibly on his demand, giving him "a newly defined rank order" according to Christoph Wolff.From 1695, an arrangement shared the responsibility for church music at the Schlosskirche (court church) between the Kapellmeister Samuel Drese and the Vize-Kapellmeister Georg Christoph Strattner, who took care of one Sunday per month while the Kapellmeister served on three Sundays. The pattern probably continued from 1704, when Strattner was succeeded by Drese's son Johann Wilhelm. When Konzertmeister Bach also assumed the principal responsibility for one cantata a month, the Kapellmeister's workload was further reduced to two Sundays per month.The performance venue on the third tier of the court church, in German called Himmelsburg (Heaven's Castle), has been described by Wolff as "congenial and intimate", calling for a small ensemble of singers and players. Performers of the cantatas were mainly the core group of the Hofkapelle, formed by seven singers, three leaders and five other instrumentalists. Additional players of the military band were available when needed, and also town musicians and singers of the gymnasium. Bach as the concertmaster probably led the performances as the first violinist, while the organ part was played by Bach's students such as Johann Martin Schubart and Johann Caspar Vogler. Even in settings like chamber music, Bach requested a strong continuo section with cello, bassoon and violone in addition to the keyboard instrument. 
Question: What is the first name of the person who described Himmelsburg as "congenial and intimate?"?

Christoph.