Input: Read this: Although not specifically prepared to conduct independent strategic air operations against an opponent, the Luftwaffe was expected to do so over Britain. From July until September 1940 the Luftwaffe attacked RAF Fighter Command to gain air superiority as a prelude to invasion. This involved the bombing of English Channel convoys, ports, and RAF airfields and supporting industries. Destroying RAF Fighter Command would allow the Germans to gain control of the skies over the invasion area. It was supposed that Bomber Command, RAF Coastal Command and the Royal Navy could not operate under conditions of German air superiority.
Question: Which tactics were the Luftwaffe excepted to use against Britain? 

Output: air operations


Input: Read this: The older 78 format continued to be mass-produced alongside the newer formats using new materials until about 1960 in the U.S., and in a few countries, such as India (where some Beatles recordings were issued on 78), into the 1960s. For example, Columbia Records' last reissue of Frank Sinatra songs on 78 rpm records was an album called Young at Heart, issued November 1, 1954. As late as the 1970s, some children's records were released at the 78 rpm speed. In the United Kingdom, the 78 rpm single lasted longer than in the United States and the 45 rpm took longer to become popular. The 78 rpm was overtaken in popularity by the 45 rpm in the late 1950s, as teenagers became increasingly affluent.
Question: With which crowd did the 45 rpm gain popularity?

Output: teenagers


Input: Read this: Under the Bretton Woods system established after World War II, the value of gold was fixed to $35 per ounce, and the value of the U.S. dollar was thus anchored to the value of gold. Rising government spending in the 1960s, however, led to doubts about the ability of the United States to maintain this convertibility, gold stocks dwindled as banks and international investors began to convert dollars to gold, and as a result the value of the dollar began to decline. Facing an emerging currency crisis and the imminent danger that the United States would no longer be able to redeem dollars for gold, gold convertibility was finally terminated in 1971 by President Nixon, resulting in the "Nixon shock".
Question: What was the fixed value of gold?

Output: $35 per ounce


Input: Read this: Nathan Knorr was appointed as third president of the Watch Tower Bible and Tract Society in 1942. Knorr commissioned a new translation of the Bible, the New World Translation of the Holy Scriptures, the full version of which was released in 1961. He organized large international assemblies, instituted new training programs for members, and expanded missionary activity and branch offices throughout the world. Knorr's presidency was also marked by an increasing use of explicit instructions guiding Witnesses in their lifestyle and conduct, and a greater use of congregational judicial procedures to enforce a strict moral code.
Question: Who was appointed as the third president of the Watch Tower Bible and Tract Society in 1942?

Output:
Nathan Knorr