---Be quick! The mid-term exam _________. I must leave for school now.----No rush. The bus _______ at 7:20, so there is enough time left.
_________ caused the accident is still a complete mystery.
It is widely _________ that smoking can cause cancer.
_________ appeared to me that he enjoyed the food very much.
_________ all the inventions have in common is _________ they have succeeded.
_________ you don't like him is none of my business.