We ________ have hurried all the way to the airport — the flight was called off because of the foggy weather.
He is so strongly built that he looks _________ he could lift an elephant.
_________ you begin the work, you must carry it out through tothe end.
I'll start early, _________ I oversleep.
I insisted that a doctor _________ immediately.
His pale face suggested that he _________ frightened.