Which language would be good to learn after English and their Mother Tounge!!!!

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Mother tounge (We should know) and English (International Language Hope everyone accepts) should know both language who interacts with people around the world. After this which would be good to learn. I mean Which language would be worth to learn which makes easier to reach people very easily and attractive.? I would like to learn a new language. Please lets start the discussion on this. So that this would be useful who is looking for... :-))