Задайте 4 типа вопросов к предложению: the problem of learning foreign languages is very important today.

Is the problem of learning foreign languages very important today?(общий)
The problem of learning foreign languages is very important today, isn't it?(разделительный)
What problem is very important today?(специальный)
Is the problem of learning foreign languages very important or not important at all today?(альтернативный)