As far as I know, it was the car accident that led to ______.
You _______ be tired—you’ve only been working for an hour.
The engineers must have worked out the design by the end of last week,_______?
It rained a lot during their journey,so they _______ have had a good time.
—Isn’t that Ann’s husband over there?—No, it _______ be him—I’m sure he doesn’t wear glasses.
We hope that as many as possible _______ join us for the picnic tomorrow.