2、i am writing to extend my gratitude to you because with your help i am now astudent of chemistry department of sydney university.
3、last june, when i applied to become a graduate student of sydney university,you really gave me a lot of valuable help. you not only wrote a recommendation（推荐） forme to professor wells who works in the sydney university but also gave mecareful and patient instructions on how to fill the application forms and writethe application letters.
4、it is your unreserved(无保留的） help that enables me to obtain this splendid（极好的）opportunityof further education. for the following two years i will study hard toreciprocate（回报） your sincere help and expectations with excellent grades.
5、yours truly,
6、zhang ying