Where her lives is a mystery. The undrlined clause is a/an

You cannot guess what type of person he is. Which clause does the underlined portion indicate?

Unless the crown can make a better case, the accused murderer will not be convicted. Underlined part of the clause is -

That everybody knew the story is obvious. The underlined part is a/an -

Name the underlined clause in the sentence ‘I will let you know as soon as the results come out’

Globally what we are experiencing is that English I replacing other languages. the underlined part is a/an-

The book which I borrowed from the library is very interesting. Name the underlined clause.