1.我非常感谢...
Reference:Thank you very much for...

2.热情友好的欢迎辞
Reference:gracious speech of welcome

3...之一
Reference:be one of

4.访问...是...
Reference:A visit to...has...

5.多年梦寐以求的愿望
Reference:has long been my dream

6...给予我一次...的机会...
Reference:(The visit will) give me　(an excellent ) opportunity to ...

7.我为...，再次表达（我的愉快之情和荣幸之感）。
Reference:I wish to say again that I am so delighted and privileged to...

8.（我对您为我到达贵国后所做的一切安排）深表感谢。
note:注意这里“到达”的动词向名词形式的转变。
Reference:I'm deeply grateful for everything you've done for me since my arrival in China.