我妈妈是英语老师，她也是一位很好的演讲者。

My mum is an English teacher, and she is also a good ___speaker.

他是一位优秀的公共演讲者。

He is a good public ___speaker.

请和我一起感谢我们今晚的客座演讲者。

Please join with me in thanking our guest ___speaker tonight.