假设你叫李明，收到美国朋友Emily的邮件。请认真阅读下面的邮件，根据邮件中的内容提示，用英语写一封意思连贯、符合逻辑的回信。
Dear Li Ping,
It’s a long time since we last met.I have joined a club called “Green Earth”.I plan to make a speech(演讲)about saving,for some people often waste things,like water, food and energy. You always have great ideas.Could you please choose one from the three and tell me why they should learn to save it and what people should do in everyday life.
I am looking forward to your reply.
Yours,
Emily
注意：1．词数80左右。信的开头和结尾已为你写好，不计入总词数：
2．信须包括所有要点，可适当发挥，使短文连贯、通顺。
Dear Emily,
Thank you for your letter.
 
Yours,
Li Ming