While other scientists are keeping__ __eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in __ __humans.
| A．a , / | B．an, / | C．the, an | D．an, the |
The head of the company promised to deal with matters of this sort________he returned to his office.
| A．until |
| B．while |
| C．by the time |
| D．the moment |
I was not________ that I had cut myself until I saw the blood all over my hand.
| A．astonished |
| B．annoyed |
| C．conscious |
| D．afraid |
—Why do you choose to work in an international travel agency?
—Well，you know，English is my ________，so it is my best choice.
| A．strength |
| B．talent |
| C．ability |
| D．skill |
The idea for the new plan came to his mind，________ to his experiment in the lab.
| A．while devoting |
| B．while devoting himself |
| C．while he was devoted |
| D．while devoted |
Your understanding on the theory is________satisfactory. You must read more after class.
| A．far from |
| B．up to |
| C．along with |
| D．free of |