____some doubt among scientists about the cause of cancer.
| A．It exists | B．There exists | C．There is existing | D．It is existing |
I fell asleep while working on this paper _______ the computer on.
| A．as | B．for | C．over | D．with |
My daughter, _________ all kinds of meat, would not like to eat any vegetable, which worries me a lot.
| A．devoted to | B．addicted to | C．accustomed to | D．exposed to |
It was in the lab _____ was taken charge by Professor Wang ______ they did the experiment.
| A．where, that | B．that, which | C．that, where | D．which, that |
No one can avoid ______ by advertising; it is everywhere.
| A．being influenced | B．influenced | C．influencing | D．to be influenced |
With all the audience ________, the speech began.
| A．sat | B．seating | C．seated | D．having seated |