Dear Mr and Mrs Johnson ,
I am now writing these few lines to express my sincere thanks . When I think of the wonderful two weeks I spent in Australia . I just can’t help thinking of you .It was so kind of you to have provided everything to make my staying there such a happy and lucky experience . I’ve learned so much , not only English but also culture . Thank you very much . I’ll always remember this trip as well as your kindness .
I’ll keep in touch and write to you later . Please take care and give my kind regards to your family .