Don't make any noise. Her mother _______ by a doctor.
| A．examined |
| B．is being examined |
| C．has been examined |
| D．is examining |
They planned to go to Beijing for sightseeing, but because of their daughter's unexpected illness they had to stay at home _____.
| A．instead | B．really | C．however | D．though |
And video cameras can be used to_______ people’s actions at home.
| A．keep | B．make | C．record | D．watch |
The international police has come into existence and they were ____ the key to global security.
| A．thus | B．for | C．or | D．otherwise |
The boy was in the water and his canoe was_______ away.
| A．running | B．floating. | C．flowing | D．pulling |
The task is hard, ____, the workers managed to finish it in time.
| A．therefore | B．otherwise | C．however | D．yet |