—Robert is indeed a wise man.
—Oh, yes. How I have regretted ____ __his advice?
| A．to take | B．taking | C．not to take | D．not taking |
George returned after the war, only __________ that his wife had left him.
| A．to be told | B．telling |
| C．being told | D．told |
Having finished her project, she was invited by the school __________ to the new students.
| A．speaking | B．having spoken |
| C．to speak | D．to have spoken |
Let those in need __________ that we will go all out to help them.
| A．to understand | B．understand |
| C．understanding | D．understood |
Birds' singing is sometimes a warning to other birds __________ away.
| A．to stay | B．staying |
| C．stayed | D．stay |
__________ warm at night, I would fill the woodstove, and then set my alarm clock for midnight so I could refill it.
| A．Staying | B．Stayed |
| C．To stay | D．Stay |