I knocked on the door but ______answered.

If it_______ rain tomorrow ,we would have to put off the visit to the museum.[ ]

Have you heard that Mo Yan was awarded the NobelPrize in Literature last year— _____. He has made a positive contribution to thatfield.

The black teacher set a good example _____ all the rest of the group, ____all peace-loving people.

He set out for a remote village for ____ he hoped would be a peaceful retirement.