The Three Golden Rules of presentations are

1. Stand up
2. Speak up
3. Shut up

They may need a little elaboration:

Stand Up

• Be visible, but do not stand in one place with your hands in your pockets, or even worse: sit behind a desk.
• Move about. Show that you are in command by occupying and using your area, the stage or the floor space that is yours.

Speak Up

• Speak in a good, clear voice.
• Use your voice as an instrument to keep the audience's attention and to underline the most important points in your presentation.
• Use eye contact to maintain a rapport with the listeners.
• If appropriate, use humour as a way of creating contact
• Tackle questions in a positive, friendly way.

Shut Up

• Know when to stop.
• Plan your presentation effectively, so that you give the most important information in a way that will be remembered
• Do not try to say too much - you will either end up spending too much time or drown the audience in a flood of information they will not be able to digest.
• Do not be afraid to improvise if necessary. If you instinctively feel that the audience is becoming restless or bored, it might be a good idea to skip a couple of points in order to highlight the really important message.

Complete this summary of the main points by choosing the correct alternative (an adjective to describe a noun or pronoun, or an adverb of manner or an adverb of degree)

1. It is  naturalnaturally that you feel a little  nervousnervously
2. It is however  vitalvitally important that you do not act  nervousnervously
3. Sometimes it may be  necessarynecessarily to improvise.
4. Improvisation is not  necessarynecessarily a bad thing.
5. A very  importantimportantly point to remember is that you should not speak in a  monotonousmonotonously voice.
6.  FinalFinally: you must remember to speak  clearclearly.