Do you think that people from English-speaking countries should make more effort to learn a foreign language, even though English is the world's most widely-spoken language?

If you think Yes, then what languages should we learn?

P.S. I have a basic knowledge of French, German and Welsh, do you think that any of these languages are of use internationally?

I am keen to learn a foreign language (preferably more in future) and as I am a fast learner and not too dull, I think I'll be able to study it no matter how complex it is in terms of grammar/script/etc.

So why not learn something that will be useful?

Mandarin is one of the most spoken languages in the world but will it be needed in future? I'm planning on studying medical science, by the way. I was wondering about Spanish since there are a lot of countries that use it. What about French, Italian and Portuguese? Are they widespread?

I'm acquainted with English (duh!), Sanskrit, Hindi, Urdu and some regional languages, too.

So what do you think? Which language(s) would be most useful?

By the way, I won't be having much problem learning any kind of language... except something spoken by a small number like Zulu, Welsh or something like that, for which the books and classes aren't easily available.

I want to learn a foreign language but i cant decide one and none besides German Welsh or Gaelic. Im in my 2nd year of German in High School so i have previous knowledge of German but i don't really try in that class so i haven't learned as much as i should of i guess. Gaelic- Im an Irish American and i have a ton of irish/scottish background like My great great great great aunt was the Queen of Scotland and i absolutely love the culture of Ireland. Welsh- Im going to want to some day live in the UK, Germany, or Ireland and Welsh seems like a pretty cool language, i do not have any previous knowledge of Welsh. So just whats your guys opinion on what i should learn and most likely i will end up living in one of these places?