Wouldn't it be _____ wonderful world if all nations lived in _____ peace with one another?
Most whales must come up for air after several minutes, _______ a few can stay under water for an hour or more.
—I wonder whom you are waiting for.—The policeman _______ the traffic accident.
Jobs are hard to get and, _______, more young people are continuing their education.
—Tony, come down and help me with the heavy box! — Come on! I _______ all day long.Get Peter to do that!
— I saw Mr Li at the meeting yesterday.— Did you? He _______ have attended it, for he had asked for sick leave.