Задать 8 вопросов active voice к предложению "some students failed their entrance exams."

Some students failed their entrance exams, didn't them?
Did any students fail their entrance exams?
Did any students or pupils fail their entrance exams?
Did any or all students fail their entrance exams?
Did any students fail their entrance exams or tests?
Who failed their entrance exams?
Why did any students fail their entrance exams?
What did any students fail?