A person who presents a speech

(a)  

To use your hands when presenting

(a)  

To clap your hands

(a)  

To speak clearly and beautifully

(a)  

To give a presentation or say a speech to lots of people

(a)  

To contradict (argue against) something

(a)  

To increase the volume / make a sound louder

(a)  

To talk about one particular thing in detail

(a)