He will come to understand your efforts sooner or later. It’s just a matter of _____.
—Shall I stop here? —No.Go on _____ ,please.
Do you remember _____ Mr.Smith at the meeting last Saturday?
I don't feel like _____ tonight as I'm so tired.
—Good morning,Bill. —Did you have any trouble _____ through the snow?
We hoped _____ being there would make the work easier.