While building a tunnel through the mountain, _____.
| A．an underground lake was discovered |
| B．workers discovered an underground lake |
| C．there was an underground lake discovered |
| D．a lake was discovered underground |
He behaved _____ nothing had happened.
| A．even if |
| B．as if |
| C．just like |
| D．even though |
I'd like to buy a house-modern, comfortable, and _____,in a quiet neighborhood.
| A．in all |
| B．above all |
| C．after all |
| D．at all |
The elderly need special care in winter, as they are _____ to the sudden changes of weather.
| A．sensitive |
| B．sensible |
| C．easy |
| D．careful |
As students, we should devote ourselves _____ our study.
| A．for |
| B．of |
| C．to |
| D．over |
Seeing a _____ smile on his face, no one doubtsthat he will get through the driving test.
| A．curious |
| B．upset |
| C．serious |
| D．confident |