Dear Blake,
Have a nice day!
Thanks for your letter and I am very glad to receive your invitation to Australia travel.
I really want to visit your contury and spend a wonderful holiday with you.
But I have to join the school social practice during the vacation,visiting factories and countries.
Also I want to improve my English grammer in this vacation.
So, I am really sorry that I can not accept your invitation.
But I have another good idea, how about you travel to Qingdao?
I will be your guide and we may have a wonderful holisay too.
Waiting for your eary reply.
Yours:Lihua