95 ! 5 типов вопросов к предложению: northern ireland became a part of the united kingdom in 1920.

1) When did Northern Ireland become a part of the United Kingdom?
2) Did Northern Ireland become a part of the United Kingdom in 1920?
3) Did Northern Ireland became a part of the United Kingdom in 1920 or 1930?
4) Northern Ireland became a part of the United Kingdom in 1920, did not it?
5) What became a part of the United Kingdom in 1920? 

Dear Mr (Mrs)
I'd like to participate in the program of exchanging students. Here is a number of reasons for why I submit an application.
Firstly, I'm very interested in culture, history and people of Canada. The program will give me a good opportunity to compare my actual knowledge of Canada and the reality. I suppose, that canadian society is effective in diverse directions: state institutions are transparent, industry is well-developed, the standart of living is high, and people are thinking about their future. I want to know how Canada achieved it and to bring this knowledge backin Russia to apply it here. I firmly believe my generation can do a lot for Russia.
Secondly, in my point of view, both of this countries are similar. Russia and Canada are countries of multicultural diversity. Both of them are huge, I ment the size of territory and the population. Canadians and Russians have a rich history, unique culture and outstanding technological achievements. Student exchangement can bridge the gap between our countries and make all us better.
To sum up, when I'll come back, I'll have my own impressions and the image of Canada, my own experience that will contribute to a better understanding of cultures and that will make our world a bit safer.

Dear Mr (Mrs)
I'd like to participate in the program of exchanging students. Here is a number of reasons for why I submit an application.
Firstly, I'm very interested in culture, history and people of Canada. The program will give me a good opportunity to compare my actual knowledge of Canada and the reality. I suppose, that canadian society is effective in diverse directions: state institutions are transparent, industry is well-developed, the standart of living is high, and people are thinking about their future. I want to know how Canada achieved it and to bring this knowledge backin Russia to apply it here. I firmly believe my generation can do a lot for Russia.
Secondly, in my point of view, both of this countries are similar. Russia and Canada are countries of multicultural diversity. Both of them are huge, I ment the size of territory and the population. Canadians and Russians have a rich history, unique culture and outstanding technological achievements. Student exchangement can bridge the gap between our countries and make all us better.
To sum up, when I'll come back, I'll have my own impressions and the image of Canada, my own experience that will contribute to a better understanding of cultures and that will make our world a bit safer.