In the cafeteria, I saw my sister and her three friends, none of ____ I had ever seen before.
| A．them | B．which | C．whom | D．those |
Though the man was badly hurt in the accident, he was still ______ and could think clearly.
| A．awake |
| B．aware |
| C．conscious |
| D．confused |
- Could you do me a favor?
- It depends on ______ it is.
| A．which |
| B．whichever |
| C．what |
| D．whatever |
Over the past decades, the sea ice ______ in the Arctic as a result of global warming.
| A．had decreased |
| B．decreased |
| C．has been decreasing |
| D．is decreasing |
Giving up smoking______the risk of heart disease.
| A．reduces |
| B．collect |
| C．increase |
| D．warn |
Further measures will be taken to ______ our streets of crime.
| A．remove |
| B．cut |
| C．reduce |
| D．rid |