Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
He said that he was good at mathematics, ___________?
Maria has written two novels, both of ______ have been made into television series.
I found that the homework was not _______ as what I used to get in my old school.
Is this the factory______ he worked ten years ago?
______ entering the room, she opened her bag to review lessons.