Dear Mr. Smith,

I'm Li Hua. As the president of the student union of Xinhua High School, I'm writing with the honor of presenting you with an invitation to participate in an activity at our school on Animal Protection Day and deliver a one-hour speech.

The activity, on the theme of "Human Beings and Animals", will take place at the school playground from 13:00 to 18:00 on 22 May with the following agenda. First is an expert lecture on "Wildlife and Protection", aiming at helping students acquire a better knowledge of animal protection. Next is a seminar among students, where they can participate in a further discussion on its approaches.

Sir, your thoughtful consideration of our invitation is greatly appreciated. You can contact me at 12345678 if you require additional information.

Best regards,

Li Hua