We tried to ring you back，Bryan，but we think we ________ your number incorrectly.
| A．looked up | B．got through |
| C．took down | D．worked out |
There is much ______ can be done about the accidents ______ from carelessness.
| A．which, arose | B．that, arising | C．which, arisen | D．that, arise |
The time is not far away ______ modern communications will become widespread in China’s vast countryside.
| A．when | B．as | C．until | D．before |
Most parents encourage their children to take an active part in social events, ______ those events do not interfere with their studies.
| A．concerning | B．until | C．unless | D．provided |
When I try to understand ______ that prevents so many Americans from being happy as one might expect, it seemed to me that there are two causes.
| A．why it does | B．what it does | C．what it is | D．why it is |
Many newspaper printed the governor’s statement ______ would resign his position.
| A．that he | B．was that he | C．in which he | D．and it |