Only when ___ possible to settle the problem.
| A．does the chief editor come will it be | B．the chief editor comes will it be |
| C．has the chief editor come will it be | D．the chief editor comes it will be |
Because of the heavy traffic, it was already time for lunch break __________ she got to her office.
| A．since |
| B．that |
| C．when |
| D．until |
__________ all of them are strong candidates, only one will be chosen for the post.
| A．Since |
| B．While |
| C．If |
| D．As |
__________ volleyball is her main focus , she's also great at basketball.
| A．Since |
| B．Once |
| C．Unless |
| D．While |
Please call my secretary to arrange a meeting this afternoon，or __________ it is convenient to you.
| A．whenever |
| B．however |
| C．whichever |
| D．wherever |
At school, some students are active __________ some are shy, yet they can be good friends with one another.
| A．while |
| B．although |
| C．so |
| D．as |