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

In 1492，Columbus ________ on one of the Bahama islands，but he mistook it for an island off India.

My mother asked me where _____, and I told her that I was going to buy some food.

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

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