To their surprise, they found the lecture given by the famous professor easy ______.
| A．to be understood | B．to understand |
| C．understanding | D．understood |
Listen！Do you hear someone for help?
| A．calling |
| B．call |
| C．to call |
| D．called |
The old man, abroad for twenty years , is in the way back to his motherland.
| A．to work |
| B．working |
| C．to have worked |
| D．having worked |
The government plans to bring in new laws parents to take more responsibility for the education of their children.
| A．forced |
| B．forcing |
| C．to be forced |
| D．having forced |
The retired man donated most of his savings to the school damaged by the earthquake in Yushu, the students to return to their classrooms.
| A．enabling |
| B．having enabled |
| C．to enable |
| D．to have enabled |
He had a wonderful childhood, with his mother to all corners of the world.
| A．travel |
| B．to travel |
| C．traveled |
| D．traveling |