Dear Jack,

Thank you very much for your invitation.

I’d love to accept it and take this opportunity to introduce traditional Chinese painting to foreign friends, but I’m sorry to inform you that I can’t. The reason is that I, together with my classmates, am busy preparing myself for the coming National College Entrance Examination, which is very important for me

I strongly recommend my friend Anna, who is the most suitable choice to take my place next month. She began to learn painting at an early age and has a good knowledge of traditional Chinese painting, which, combined with her active personality and perfect spoken English, will help make your activity a success.

Sorry again for any inconvenience caused by my absence and all the best wishes to you.

Best wishes.

Yours sincerely,