Question: "what is the second type of energy source mentioned?" Context: "In 2004, a large share of natural gas reserves in Iran were untapped. The addition of new hydroelectric stations and the streamlining of conventional coal and oil-fired stations increased installed capacity to 33,000 megawatts. Of that amount, about 75% was based on natural gas, 18% on oil, and 7% on hydroelectric power. In 2004, Iran opened its first wind-powered and geothermal plants, and the first solar thermal plant is to come online in 2009. Iran is the third country in the world to have developed GTL technology." Answer:
Ans: hydroelectric

Question: "Who was killed in the accident?" Context: "From the 1950s on, the students were also used for unpaid work at schools, where they cleaned and performed repairs. This practice has continued in the Russian Federation, where up to 21 days of the summer holidays is sometimes set aside for school works. By law, this is only allowed as part of specialized occupational training and with the students' and parents' permission, but those provisions are widely ignored. In 2012 there was an accident near city of Nalchik where a car killed several pupils cleaning up a highway shoulder during their "holiday work" as well as their teacher who was supervising them." Answer:
Ans: several pupils cleaning up a highway shoulder during their "holiday work" as well as their teacher

Question: "How does one gain an indifference to pain?" Context: "Although unpleasantness is an essential part of the IASP definition of pain, it is possible to induce a state described as intense pain devoid of unpleasantness in some patients, with morphine injection or psychosurgery. Such patients report that they have pain but are not bothered by it; they recognize the sensation of pain but suffer little, or not at all. Indifference to pain can also rarely be present from birth; these people have normal nerves on medical investigations, and find pain unpleasant, but do not avoid repetition of the pain stimulus." Answer:
Ans: birth

Question: "What happened in the month prior to February?" Context: "Season 11 premiered on January 18, 2012. On February 23, it was announced that one more finalist would join the Top 24 making it the Top 25, and that was Jermaine Jones. However, on March 14, Jones was disqualified in 12th place for concealing arrests and outstanding warrants. Jones denied the accusation that he concealed his arrests." Answer:
Ans: Season 11 premiered