TASK DEFINITION: This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.
PROBLEM: Passage: In March 1968, CBS and Sony formed CBS/Sony Records, a Japanese business joint venture. With Sony being one of the developers behind the compact disc digital music media, a compact disc production plant was constructed in Japan under the joint venture, allowing CBS to begin supplying some of the first compact disc releases for the American market in 1983.

SOLUTION: In March 1988, CBS and Sony formed what group?

PROBLEM: Passage: Han Chinese make up the vast majority of the population, and the largest Han subgroup are the speakers of Wu varieties of Chinese. There are also 400,000 members of ethnic minorities, including approximately 200,000 She people and approximately 20,000 Hui Chinese[citation needed]. Jingning She Autonomous County in Lishui is the only She autonomous county in China.

SOLUTION: What kind of Japanese make up the vast majority of the population?

PROBLEM: Passage: After losing the 1970 general election, Labour returned to opposition, but retained Harold Wilson as Leader. Heath's government soon ran into trouble over Northern Ireland and a dispute with miners in 1973 which led to the "three-day week". The 1970s proved a difficult time to be in government for both the Conservatives and Labour due to the 1973 oil crisis which caused high inflation and a global recession. The Labour Party was returned to power again under Wilson a few weeks after the February 1974 general election, forming a minority government with the support of the Ulster Unionists. The Conservatives were unable to form a government alone as they had fewer seats despite receiving more votes numerically. It was the first general election since 1924 in which both main parties had received less than 40% of the popular vote and the first of six successive general elections in which Labour failed to reach 40% of the popular vote. In a bid to gain a majority, a second election was soon called for October 1974 in which Labour, still with Harold Wilson as leader, won a majority of three, gaining just 18 seats taking its total to 319.

SOLUTION:
What did Labour do after winning the 1970 general election?