Our enemy bills have been increasing steadily. these costs,our telephone costs have doubled over the past six months.
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.
—I seldom watch TV, but listen to the radio a lot. —_______.