The elevator _________ and we were trapped inside for half an hour.
| A．broke off | B．broke in | C．broke out | D．broke down |
Washington D.C. ______ between Virginia and Maryland on the Potomac River.
A. lays. B. lies C. sits D. seats
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 |