一、Dear sir/madam:
　　Im delighted you have accepted our
　　invitation to speak at the Conference
　　in [city] on [date].
　　As we agreed, youll be speaking on
　　the topic "" from [time] to [time]. There
　　will be an additional minutes for questions.
　　Would you please tell me what kind of
　　audio-visual equipment youll need. If you
　　could let me know your specific requirements
　　by [date], Ill have plenty of time to make
　　sure that the hotel provides you with what
　　you need.
　　Thank you again for agreeing to speak.
　　I look forward to hearing from you.
　　Sincerely yours,
　　[name]
　　[title]
　　二、Dear sir/madam:
　　Thank you for your letter of [date].
　　Im glad that you are also going to [place]
　　next month. It would be a great pleasure
　　to meet you at the [exhibition/trade fair].
　　Our company is having a reception at
　　[hotel] on the evening of [date] and I would
　　be very pleased if you could attend.
　　I look forward to hearing from you
　　soon.
　　Yours sincerely,
　　[name]
　　[title]
　　三、Dear sir/madam:
　　[organization] would very much like
　　to have someone from your company speak
　　at our conference on [topic].
　　As you may be aware, the mission of
　　our association is to promote . Many of
　　our members are interested in the
　　achievements your company has made in .
　　Enclosed is our preliminary schedule for
　　the conference which will be reviewed in
　　weeks. Ill call you [date] to see who from
　　your company would be willing to speak to
　　us. I can assure you that well make everything convenient to the speaker.
　　Sincerely yours,
　　[name]
　　[title]

　　四、Dear sir/madam:
　　We would like to invite you to an
　　exclusive presentation of our new [product].
　　The presentation will take place at
　　[location], at [time] on [date]. There will
　　also be a reception at [time]. We hope you
　　and your colleagues will be able to attend.
　　[company] is a leading producer of
　　high-quality . As you well know,
　　recent technological advances have
　　made increasingly affordable to the
　　public. Our new models offer superb
　　quality and sophistication with
　　economy, and their new features
　　give them distinct advantages
　　over similar products from other
　　manufacturers.
　　We look forward to seeing you on [date].
　　Just call our office at [phone number] and
　　we will be glad to secure a place for you.
　　Sincerely yours,
　　[name]
　　[title]
　　五、Dear sir/madam:
　　On [date], we will host an evening
　　of celebration in honor of the retirement
　　of
　　[name], President of [company]. You are
　　cordially invited to attend the celebration
　　at [hotel], [location], on [date] from to p.m.
　　[name] has been the President of
　　[company] since [year]. During this
　　period, [company] expanded its business
　　from to . Now its our opportunity to
　　thank him for his years of exemplary
　　leadership and wish him well for a
　　happy retirement. Please join us to
　　say Good-bye to [name].
　　See you on [date].
　　Yours sincerely
　　[name]
　　[title]