Not for a moment ______ that this disease was caused by certain virus.
| A．he have doubted | B．he doubts | C．did he doubt | D．he did doubt |
It will do you good to _____ a holiday.
| A．spend | B．make | C．take | D．do |
If you can speak very ______ English, you will have more chances to find a job than others.
| A．correct | B．pure | C．proper | D．exact |
I've promised to help you and I'll _____ my word.
| A．hold | B．keep | C．follow | D．take |
It is not the _____ way for America to deal with some problems of Iraq (伊拉克) only by force.
| A．important | B．difficult | C．proper | D．exact |
The police are _____ a search for the body of the man who disappeared.
| A．doing | B．taking | C．giving | D．making |