Observe the reactions of the audience
Time to talk to thoroughly sweep periodically to see if they listen or not to listen. He nodded, understanding that Or frowned with suspicion. Or who are already asleep. It has modified atmosphere
To read or not to retain the listener.
It's boring, it does not allow anyone who asked. Fear of forgetting what the best way is to recite rehearsed and understood the content to speak for all. Well before Can not be read or recited to anyone. Finally, before ending the speech should let the audience ask questions and talk briefly summarizes the audience more insight.