Problem: Qing dynasty:

Zeng Guofan had no prior military experience. Being a classically educated official, he took his blueprint for the Xiang Army from the Ming general Qi Jiguang, who, because of the weakness of regular Ming troops, had decided to form his own "private" army to repel raiding Japanese pirates in the mid-16th century. Qi Jiguang's doctrine was based on Neo-Confucian ideas of binding troops' loyalty to their immediate superiors and also to the regions in which they were raised. Zeng Guofan's original intention for the Xiang Army was simply to eradicate the Taiping rebels. However, the success of the Yongying system led to its becoming a permanent regional force within the Qing military, which in the long run created problems for the beleaguered central government.

What did Qi Jiguang's private army do?
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A: repel raiding Japanese pirates

Problem: Egypt:

The United States provides Egypt with annual military assistance, which in 2015 amounted to US$1.3 billion. In 1989, Egypt was designated as a major non-NATO ally of the United States. Nevertheless, ties between the two countries have partially soured since the July 2013 military coup that deposed Islamist president Mohamed Morsi, with the Obama administration condemning Egypt's violent crackdown on the Muslim Brotherhood and its supporters, and cancelling future military exercises involving the two countries. There have been recent attempts, however, to normalise relations between the two, with both governments frequently calling for mutual support in the fight against regional and international terrorism.

What event soured relations of US and Egypt in 2013?
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A: Egypt's violent crackdown on the Muslim Brotherhood and its supporters

Problem: Web browser:

Opera debuted in 1996; it has never achieved widespread use, having less than 2% browser usage share as of February 2012 according to Net Applications. Its Opera-mini version has an additive share, in April 2011 amounting to 1.1% of overall browser use, but focused on the fast-growing mobile phone web browser market, being preinstalled on over 40 million phones. It is also available on several other embedded systems, including Nintendo's Wii video game console.

Opera is also available on which video game console?
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A: Nintendo's Wii

Problem: British Empire:

In September 1982, Prime minister Margaret Thatcher travelled to Beijing to negotiate with the Chinese government on the future of Britain's last major and most populous overseas territory, Hong Kong. Under the terms of the 1842 Treaty of Nanking, Hong Kong Island itself had been ceded to Britain in perpetuity, but the vast majority of the colony was constituted by the New Territories, which had been acquired under a 99-year lease in 1898, due to expire in 1997. Thatcher, seeing parallels with the Falkland Islands, initially wished to hold Hong Kong and proposed British administration with Chinese sovereignty, though this was rejected by China. A deal was reached in 1984under the terms of the Sino-British Joint Declaration, Hong Kong would become a special administrative region of the People's Republic of China, maintaining its way of life for at least 50 years. The handover ceremony in 1997 marked for many, including Charles, Prince of Wales, who was in attendance, "the end of Empire".

When did Britain hand over Hong Kong to China?
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A:
1997