First of all, do not let this minor misfortune spoil your entire speech. Keep speaking about the issues you remember as no one in the auditorium is able to compare your speech to the text. Another variant is to return to the beginning of semantic block and expound your ideas in different expressions. You may also return to the beginning of the phrase and start developing the topic.
Simple physical exercising might reduce your stress and help you abstract from the forthcoming speaking. You can wave your hands or breath in and out mightily for several times (of course you should not do such exercising in front of the auditorium and even more importantly do not perform such operations just before you start speaking as this will impair your breathing and consequentially affect your tone). It is categorically discouraged to take depressants or any other medications as they ordinarily disseminate your attention and condition drowsiness.
Many speakers start expounding the primary idea without preparing the auditorium properly. Rather than doing so, it is preferable to store up some “ice-breakers” – special phrases that serve to break the distrust.
Keep the auditorium in constant suspension by addressing it with different impellent inquiries. By touching upon different perception channels, you will not let your auditorium relax or lose interest in your speech.
Psychologists proved that moving objects attract seven times more attention than static ones. However, you should always control your body language and never overuse gestures or utilize excessive movements.
Neurophysiologists determined that silence is the best way to stir the audience’s perception to activity. Use pauses in your speech to make your listeners think.
Do not strive to answer each and every question that auditorium asks you. Your speech must be concluded neatly and definitely. Do not forget to thank your auditorium for attention.