1) Why is English the world's top language? Because it is international language.
2) ( "What will the role of English be in the 21-bt century?" второй вопрос точно без ошибок списан? В нем нету смысла. )
3) Why are you learning English? Because, i can travel to any country.
4) Do you think you can do without English in your life? Not too much.