The professor devoted all his life ____the treatment of AIDS.A to research B.in researching C.to researching D.at researching
The final _____ of the play will take place on Monday.
I'm afraid this painting is not by Picasso. It's only a copy and so it's _____.
Obviously, he’s very disappointed at the way things have_____.
This lecture is by no means the most boring. I’ve attended_____.
The mother felt herself____ cold and her hands trembled as she read the letter from the battlefield.