<p>
In the process of implementing this graduation paper, I have to face to many difficulties. But
thanks to the help and guidance of many people, I overcame all troubles and completed my
graduation paper.
First of all, I do want to express may grateful thanks to Mrs Tran Thi Ngoc Lien – my supervisor
for her encouragement and guidance. During my study process, she has willingly and readily
suggested and given me valuable advice and detail comments about my study.
Furthermore, never can I forget the help and enthusiastic guidance of teachers in foreign
language department. It’s them that have led me through lectures during four year. Thank to that
knowledge background, I could select this topic and fulfill my study.
Last but not least, I am really grateful to may family and friends for their serious support and
encouragement.
</p>
