—____—It’s ten o’clock.

Bob had little idea that his wife was in danger, _____?

—I don't imagine Russ and his poor dog had a good time on 　the deserted island，________？—I have no idea. 

 —          do you surf on the Internet?—Once every week. I watch some latest news and chat with my pals there.

— ______ didn’t Sally play the violin at the concert last night?—She said that her hand hurt, but that was only an excuse. I saw her play tennis just now.