Yesterday, I came across my former classmate, but his name ________ me, which made me embarrassed.

Bob looked back only to find an old classmate whose name ________ him for the moment.

He came to my class every week, but his attitude ________ he was not really interested in the subject. 

In our childhood, we were often_____ by Grandma to pay attention to our table manners.

(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.