谁知道英语演讲的开场白和谢幕词怎么讲啊？

ladies and gentalmen :
Good afternoon! Thank you for giving me the chance .

That's all . Thanks for your listening .

开场白:Hello,good afternoon,everybody.Nice to meet you all here.Now let me introduce myself.My name is###.I'm from *** School.I'm honored to give a speech here.Today,I'm going to talk about XXX(your topic)
谢幕词：That's all.Thanks for listening.

Hello everyone!Thank you for giving me this chance to make a speech here.Now I am going to talk about******

That's all.Thanks for listening.

good afternoon ladies and gentlemen, it's my honor to stand here giving you a speech. today, i would like to talk about.../my topic today is ...

That's all.Thank you for you attention.