All Hangzhou drivers are required to _______ the departments of traffic control of any changes in their personal information.
| A．inform | B．perform | C．reform | D．transform |
Tom was about to close the window __________ his attention was caught by a bird.
| A．when |
| B．if |
| C．and |
| D．till |
Mary made coffee __________ her guests were finishing their meal.
| A．so that |
| B．although |
| C．while |
| D．as if |
One Friday, we were packing to leave for a weekend away __________ my daughter heard cries for help.
| A．after |
| B．while |
| C．since |
| D．when |
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 |