1)English 2)English is a truly international language.It is the language of shipping and aviation, of science and technology and of commerce.3)Yes, It is spoken as a mother tongue in the UK, in former colonies such as Australia and New Zealand, and of course, by the vast majority of the North American population4)Because it is the second or official language in most of the former empires, and of course, it is studied as a foreign language all over the world, but particularly in Europe now.