Scientists are hoping for a _____ in the search for a cure for cancer.
| A．breakthrough | B．break | C．deal | D．progress |
It's surprising that your brother ________Russian so quickly—he hasn't lived there very long.
| A．picked up |
| B．looked up |
| C．put up |
| D．made up |
You'd better________ the instructions so that the children could understand them.
| A．decline |
| B．reduce |
| C．concentrate |
| D．simplify |
I'd like to take________of this opportunity to thank you for your help.
| A．advantage |
| B．case |
| C．use |
| D．care |
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 |