The reason_________ he didn't come was _________ he had to take care of his sick mother.
| A．why ; that | B．why ; which |
| C．which ; why | D．that ; for |
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 |
Mrs. Clarke raised the kettle and _______the water over the hand.
| A．spread | B．dropped | C．poured | D．covered |
Our cousin who is attending college in New York phones us every Sunday at six, _________ as clockwork.
| A．usually | B．frequently | C．regularly | D．commonly |