The correct answers are:
1. True;
In the European Union there's members from all parts of the continent, including Central and Eastern Europe.
2. False;
Northern Ireland, even though is located on the island of Ireland, it is actually a part of the United Kingdom of Great Britain and Northern Ireland.
3. Ireland;
The Republic of Ireland, or simply Ireland, is not part of the United Kingdom, but instead, it is a separate country.
4. Norther Ireland;
Northern Ireland can not be considered as a region in the British Isles because it is part of the Irish Island, and its division is not regional, but political.