—Listen! There is a knock on the door.Who _____ it be?—It must be Jack.Just now I sent for him.
Forty people got injured in a bus accident. Every ________ ambulance was rushed to the scene of the accident.
Come and see me whenever ________.
________ by the growing interest in nature,more and more people enjoy outdoor sports.
___around the Water Cube, we were then taken to see the Bird’s Nest for the 2008 Olympic Games.
____ succeed in doing anything .