----How unhappy your roommate looks!----Yes,but he’s not willing to tell me what it is____ is troubling him.
Professor Williams keeps telling his students that the future ______to the well-educated.
Don’t blame him any more. _______, he is only a child.
--The window is dirty. ----I know. It ______ for weeks.
The villagers went out to the mountain __________ the missing child.
There is no doubt _______ he will win.