It suddenly occurred to him __________ he had left his keys in the office.
| A．whether |
| B．where |
| C．which |
| D．that |
The WHO ________ eat less bacon and other preserved meat because they can cause cancer.
| A．appeals people to | B．appeals to people to |
| C．calls in people to | D．calls on people |
We have celebrated this festival for many years and it ________ Tang Dynasty.
| A．is dated back to | B．is dating back to |
| C．dates back to | D．dated back to |
The police are ________ the accident on dangerous driving.
| A．dislocating | B．cancelling |
| C．reflecting | D．blaming |
Listening to music at home is one thing, going to hear it ________ live is another.
| A．being performed | B．performed |
| C．performing | D．having been performed |
The old castle requires ________ after ________ by the storm.
| A．to be restored; hit |
| B．being restored; being hit |
| C．restoring; being hit |
| D．having been restored; hit |