He devoted all his life to ________ those who are suffering from cancer.
Oh, I'm not feeling well in the stomach. I ________ so much fried chicken just now.
She often shares her deepest thoughts and fears with friends through QQ, as if they ________ chatting in her living room.
—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job? —________ my students have a try?
I ________ him in time, otherwise he would have fallen off the bike.
The project was carefully planned, or a great deal of money ________.