I don’t know why he is late.—Nor do I.He__________an accident.
You _________think you're clever, but that doesn't give you the right to order me about!
--Jack's won _____________ holiday in London. --_________ lucky fellow!
____________ great help; I could get rid of all the difficulty and succeeded.
The reason__________ their failure you know is they didn't get fully prepared for the experiment.
--Why has he been staying at home these days? --He ___________ since a month ago.