( That he is very intelligent) is known to me

1)She does not know what I want.Here "what I want" is a/an-

2)Behave as a gentleman behaves.Here "as a gentleman behaves" isva/an-

3)Where he lives is a mystery. Here "Where he lives" is a/an-

4)It's a mystery where he works."where he works" is a/an-

5)You cannot get the chance to be enrolled in a university unless you study hard.
"unless you study hard" is a/an-

6)As I trust myself, I don't need to write a number on it.
"As I trust myself"-

7)What he said is important?
"What he said"-

8)The poor boy who was an orphan could not continue his studies.
"who was an orphan"-

9)Look before you leap.Here "Look" is a/an-

10)They were asked to wait till the signal was given.
"till the signal was given"-

This is the book "I lost".Here,"I lost" is-

Strike while the iron is hot.It is example of -

Sitting happily, the chicken laid eggs.

The underlined part is a/an —

He worked (with all sincerity). Here the underline phrase is-

He waited "in front of" the house-

They love each other "heart and soul "-

Dipta went to Australia "to receive higher education "-

They reached home "safe and sound"-

The train is moving "fast enough "-

I know the reason "why Mithila has done this"-