范文一：
Dear ,
On behalf of the , I would be very pleased to invite you to attend a conference of the forthcoming 1st Opportunity and Challenge to be held in xxXUniversity, China, from December 19 to December 30, 20xx.
As we all know, Google is one of the top corporations around the world in Computer Science, and the biggest Internet search service provider. At the same time, Google’s products are also famous and popular in Music, Society Network, and Smartphone Operating System et al. You are an internationally acclaimed scholar and businessman assuredly. Your research on distributed software service and parallel computation is widely used in Computer Science. Your participation will be among the highlights of the conference.
We sincerely hope that you could accept our invitation. As you know, this is the 1st held of OCCSG and we plan to make it a truly international meeting. We have accepted many papers from several disciplines.
If you can come, please let us know as soon as possible, since we have to prepare the final program soon. We are looking forward to your acceptance.
Sincerely yours,
范文二：
Dear Sirs/Madam:
We hereby sincerely invite you and your company representatives to visit our booth at The Continental Exhibition Center from April 15th to 20th 20xx.
We’re one of the manufacturers specialized in sanitaryware, concludingone & two piece toilet, wash basin, cabinet basin, pedestal basin, bidet,urinal, counter basin , decorated ceramics and so on. Our new models offer superb design and their new features give them distinct advantagesover similar products from other manufacturers.It would be a great pleasure to meet you at the exhibition.We expect to establish long-term business relations with your company in future.
Exhibition Center : The Continental Exhibition Center
Booth Number : G-K105 G-K-106
Date : Apr 15th to 20th 20xx
Best Regards
Mr.Su Jia Jian
General Manager