Which sign tells us the way out of a building

My mother is not in very good shape, and has _____ tennis to get fit.[ ]

－Tom, who taught Chinese before you came to China －Nobody. I learned it by .

Have you used the new computer ______ —Yes， I have. I have ______ used it.

ld him he was forbidden to watch TV for a month. _______, he stormed out of the room.