The police are trying to find out the ____ of the woman killed in the traffic accident.
_____ we have finished the course, we shall start doing more revision work.
I’ll never forget the days ______ I spent on the farm.
I meant to help him . ______, he didn’t accept my offer.
Several months later, he found his deskmate very difficult _______.
In order to make up for the lost time, they are working ______.