A.When they wanted to kill an enemy.B.When they wanted to identify a stranger.C.When they wanted to tell the time of the day.D.When they wanted to send a message to a person far away.
A.When they wanted to kill an enemy.
B.When they wanted to identify a stranger.
C.When they wanted to tell the time of the day.
D.When they wanted to send a message to a person far away.