Question: The multi-national Communist armed forces' sole joint action was the Warsaw Pact invasion of Czechoslovakia in August 1968. All member countries, with the exception of the Socialist Republic of Romania and the People's Republic of Albania participated in the invasion.
Is there an answer to this question: What country was invaded in August 1998?

Answer: unanswerable

Question: Welsh sides that play in English leagues are eligible, although since the creation of the League of Wales there are only six clubs remaining: Cardiff City (the only non-English team to win the tournament, in 1927), Swansea City, Newport County, Wrexham, Merthyr Town and Colwyn Bay. In the early years other teams from Wales, Ireland and Scotland also took part in the competition, with Glasgow side Queen's Park losing the final to Blackburn Rovers in 1884 and 1885 before being barred from entering by the Scottish Football Association. In the 201314 season the first Channel Island club entered the competition when Guernsey F.C. competed for the first time.
Is there an answer to this question: May Welsh clubs enter the competition?

Answer: Welsh sides that play in English leagues are eligible,

Question: YouTube offers users the ability to view its videos on web pages outside their website. Each YouTube video is accompanied by a piece of HTML that can be used to embed it on any page on the Web. This functionality is often used to embed YouTube videos in social networking pages and blogs. Users wishing to post a video discussing, inspired by or related to another user's video are able to make a "video response". On August 27, 2013, YouTube announced that it would remove video responses for being an underused feature. Embedding, rating, commenting and response posting can be disabled by the video owner.
Is there an answer to this question: What is a video called when a person records themselves watching a different video?

Answer: "video response"

Question: The Central African Republic (CAR; Sango: Kodorosese ti Beafrika; French: Republique centrafricaine pronounced: [epyblik stafikn], or Centrafrique [stafik]) is a landlocked country in Central Africa. It is bordered by Chad to the north, Sudan to the northeast, South Sudan to the east, the Democratic Republic of the Congo and the Republic of the Congo to the south and Cameroon to the west. The CAR covers a land area of about 620,000 square kilometres (240,000 sq mi) and had an estimated population of around 4.7 million as of 2014[update].
Is there an answer to this question: What country borders CAR in the North?

Answer:
Chad