Some researchers believe that there is no doubt______a cure for AIDS will be found.
The time he has devoted in the past ten years ________ the disabled is now considered ________ of great value.
The President ________ that he would visit France the following month.
The technical cooperation and cultural __________ between the two countries are daily on the increase.
This is his only request that the room __________ after being used.
Speaking of what sort of smartness is most desirable in human __________,a friend of mine told me a story.