Задайте вопросы к предложению it is usual for close friends to have similar idea. (вопросы должны быть на )

Is it usual to have similar idea for close friends?
Is it usual to have similar idea for close friends or teachers?
It is usual to have similar idea for close friends, isn't it?
What is usual for close friends?
Whom is it usual to have similar idea for?
What idea is it usual to have for close friends?

What's usual for close friends?
For whom is it usual to have similar idea?
Is it usual to have similar idea for close friends?
Which ideas is it usual for close friends to have?