let me start by thanking...

　　i'm very pleased to be here.

　　i'm very happy to have this opportunity to...

　　i feel great honored to be here.

　　it's a pleasure for me to share my experience with you all.

　　we have the great pleasure to have mr.president with us.

　　we are honored today to be joined by our distinguished guest,...

　　today i'd like to say something about...

　　well, the topic i'm going to deal with is...

　　i'm sure everybody is interested in... so i will share with you some...