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.

    Since

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