41. During her study in Massachusetts Institute of Technology she has got the degree _____ PhD, and it is a degree ______ chemistry.
—What’s the matter with Marsa ?—Well, her parents wouldn’t allow her to go to the party, but she still ___________.
It is ________ the customers’ needs that has made chain stores so popular in big cities in China.
The soldiers did what they did to rescue the survivors _______the danger of aftershock.
The headmaster suggested the problems referred __________ discussed immediately.
When he was awake, she found she was lying on _______ seemed to be a piece of stone.