Problem: In 1939, the United States had renounced its trade treaty with Japan; and, beginning with an aviation gasoline ban in July 1940, Japan became subject to increasing economic pressure. During this time, Japan launched its first attack against Changsha, a strategically important Chinese city, but was repulsed by late September. Despite several offensives by both sides, the war between China and Japan was stalemated by 1940. To increase pressure on China by blocking supply routes, and to better position Japanese forces in the event of a war with the Western powers, Japan invaded and occupied northern Indochina. Afterwards, the United States embargoed iron, steel and mechanical parts against Japan. Other sanctions soon followed. Chinese nationalist forces launched a large-scale counter-offensive in early 1940. In August, Chinese communists launched an offensive in Central China; in retaliation, Japan instituted harsh measures in occupied areas to reduce human and material resources for the communists. Continued antipathy between Chinese communist and nationalist forces culminated in armed clashes in January 1941, effectively ending their co-operation. In March, the Japanese 11th army attacked the headquarters of the Chinese 19th army but was repulsed during Battle of Shanggao. In September, Japan attempted to take the city of Changsha again and clashed with Chinese nationalist forces.
Answer this question based on the article: What did the US stop selling to Japan in 1940?
A: aviation gasoline

Problem: The disintegration of the Pagan Empire was now complete. But the Mongols refused to fill in the power vacuum they had created. They would send no more expeditions to restore order. The emperor apparently had no interest in committing troops that would be required to pacify the fragmented country. Indeed, his real aim all along may have been "to keep the entire region of Southeast Asia broken and fragmented." It would be another two years until one of Narathihapate's sons, Kyawswa, emerged as king of Pagan in May 1289. But the new "king" controlled just a small area around the capital, and had no real army. The real power in central Burma now rested with the three commander brothers. The uneasy arrangement would persist until 1297. The Mongols continued to occupy northern Burma to Tagaung as the province of Zhengmian  but ended the fictional central Burma province of Mianzhong on 18 August 1290. Meanwhile, the power struggle in central Burma continued with the three brothers blatantly consolidating support. To check their rising power, Kyawswa submitted to the Mongols in January 1297, and was recognized by the Yuan emperor Temür Khan as King of Pagan on 20 March 1297. The emperor also gave Chinese titles to the brothers as subordinates of Kyawswa. The brothers resented the new arrangement as it directly reduced their power. On 17 December 1297, the three brothers overthrew Kyawswa, and founded the Myinsaing Kingdom. The dethronement forced the Mongol government to intervene again, leading to the second Mongol invasion of Burma . The invasion failed. Two years later, on 4 April 1303, the Mongols abolished the province of Zhengmian , evacuated Tagaung, and returned to Yunnan.
Answer this question based on the article: How many years before the second Mongol invasion of Burma did the three brothers overthrow Kyawswa?
A: 4

Problem: Coming off their penalty-plagued blowout win over the Lions, the Vikings stayed at home and met in a Week 11 duel with the Seattle Seahawks. After a scoreless first quarter, the Vikings got on the board with QB Brett Favre completing a 23-yard TD pass to wide receiver Percy Harvin. Later in the same quarter, the Vikings increased their lead with an 8-yard TD pass from Favre to tight end Visanthe Shiancoe. Closing out the first half was a 3-yard TD pass from Favre to wide receiver Bernard Berrian to make a 21-0 Vikings halftime lead, the first time of the season the Vikings kept their opponent scoreless in the first half. In the third quarter, the Vikings continued to dominate as Favre found wide receiver Sidney Rice on a 7-yard TD pass. Seattle scored their first points of the game when kicker Olindo Mare nailed a 40-yard field goal. Finally, the Vikings put the game away as second-string QB Tarvaris Jackson found Rice again on a 34-yard TD pass. The Seahawks tried to rally with a 1-yard TD run by running back Justin Forsett (with a failed 2-point conversion), but the Vikings prevented the Seahawks comeback from advancing any further. With the win, the Vikings improved to 9-1. Brett Favre threw 4 TD passes for the 22nd time in his career (second of the season), breaking the mark set by Dan Marino.
Answer this question based on the article: How many touchdowns did Favre throw in the first half?
A:
3