Although he knew little about the large amount of work done in the field , he succeeded ____other more well-informed experimenters failed.
The members of the club wouldn't run a _____ in entrusting(委托) the organization to an unreliable person.
My brother likes eating very much but he isn't very _____ about the food he eats.
It isn't quite _____ that he will be present at the meeting.
Some friends tried to settle the quarrel between Mr. and Mrs. Brown without hurting the feeling of____ , but failed .
As civilization______, more and more people have realized the importance of preserving rare animals from extinction.