(2014·安徽省芜湖三校一模)A recent study has  ________an unexpected conclusion that the African elephant should be divided into two different species.

Generally speaking, every child wants to be _________ when he does something good.

The opportunity Jack had looked forward________at last when he was named chief engineer in the project.

The young man, who had rushed into the fire to save the old man, _____ rewarding.

He was a bit nervous. He _________his spare breath with a soft sound that was almost heard by the audience.