He was so deep in thought,thinking of the problem ________ he knocked into the tree without noticing it.
1 feel that one of my main duties ______ a teacher is to help the students to become better learners.
___ he did it remains a secret.
It was a pity that the great writer died _________his works unfinished.
That is not ____ I want.
In order to change attitudes _______ employing women, the government is bringing in new laws.