From bottom of my heart, I would like to show my deepest gratitude to many
people helping and encouraging me enthusiastically in preparing and completing
the graduation paper.
First of all, I would like to express my heart felt thanks to Mrs. Dang Thi Van,
(MA), my supervisor, who has given me many valuable guidance, correction and
advices for my research.
Also, I would like to thank Mrs. Tran Thi Ngoc Lien – Dean of Foreign
Language Department for her help during my completion of the paper.
Next, I am also grateful to all teachers at Hai Phong Private University, whose
support and advices has improved my study.
Last but not least, I owe sincere thanks to all members of my family and friends
for whatever they supported and encouraged me both mentally and physically in
the progress of writing this graduation paper.