One of the most important problems we will have to solve is _______ of students’ learning method.
| A．that | B．this | C．what | D．which |
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 |
I stopped the car __________ a short break as I was feeling tired.
| A．take | B．taking |
| C．to take | D．taken |
Volunteering gives you a chance __________ lives, including your own.
| A．change | B．changing |
| C．changed | D．to change |