——What do you think made Mary so upset?—— ______ her new MP4.As she lost B. Lost C. Losing D. Because of losing
_____________he referred to in his article was unknown to the readers.
______________breaks the law should be punished.
The government has to close those small factories to prevent the water of the river ______.
—Will you go swimming with me this weekend? —______.
21.Bob got seriously injured in the traffic accident, but luckily, the doctor came __________to save his life.