�、� My presentation will help solve a problem that has puzzled people for years.。。

　　② I‘m going to be speaking about something that is vitally important to all of us.

　�、� At the end of this presentation you will understand why this company has been so successful for so long.。。

　　④ I am going to be talking about a product that could double your profit margins.。。

　　⑤ the next ten minutes will change your attitude to sales and marketing.。。

　�、� Over the next ten minutes you are going to hear about something that will change the way your companies operate.。。

　�、� By the end of this presentation you will know all there is to know about.。。