—It’s good to see you again.—Yes. I keep all the letters __________ you wrote to me over the years.
_____ 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 ______.