The public ___ of the environmental problem will make the government take it seriously.
| A．existence |
| B．revolution |
| C．awareness |
| D．evidence |
The maid is said __________ in the family when she was serving there.
| A．to be treated badly | B．having been treated badly |
| C．being badly treated | D．to have been badly treated |
Air pollution is getting more and more serious, so we must take action __________ it is too late.
| A．before | B．after |
| C．until | D．when |
Private cars really provide much convenience to people, and __________ they cause too many problems.
| A．meanwhile | B．therefore |
| C．otherwise | D．instead |
Zhao Benshan, whose overwork __________ his health failure, is said to have performed in the Spring Festival Gala on CCTV in 2011.
| A．contributed to | B．appealed to |
| C．applied to | D．owed to |
All the drivers have been warned that driving after drinking shall serious accidents.
| A．bring up | B．bring about |
| C．bring in | D．bring back |