I'm sorry you've been waiting so long,but it'll still be some time ________ Brian gets back.
—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.