His latest research is at the of genetic science.
| A．maiden voyage | B．cutting edge |
| C．focus group | D．daily basis |
._____used to be her job ,but she has now turned_______.
| A．To teaching ,to advertising | B．Teaching, t advertise |
| C．Teaching ,to advertising | D．To teach , an advertising |
There ______to buses. we had no choice but _______at a small hotel for the night.
were ,to stay B. being , to stay C. being ,stay D. were ,stay
When ____behind , the little girl always cries for Mum.
| A．leaving | B．being left | C．t leave | D．left |
Tom drank up the whole bottle of milk, _____even a drop to his little brother.
| A．not leave | B．leaving | C．not leaving | D．not to leave |
John planned _____around Europe on horseback, but his ambition has not been achieved till today.
| A．to have traveled | B．to travel | C．traveling | D．his traveling |