-----This returned Chinese scholar has become one of the top experts in this field.-----Yes, I know him very well. He _____ in Africa with wild animals for eight years.
I fell asleep while working on this paper _______ the computer on.
My daughter, _________ all kinds of meat, would not like to eat any vegetable,which worries me a lot.
It was in the lab _____ was taken charge by Professor Wang ______ they did the experiment.
No one can avoid ______ by advertising; it is everywhere.
With all the audience ________, the speech began.