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ACKNOWLEDGEMENTS First of all, I would like to express my sincere and special gratitude to Mrs.
Pham
Thi Bich Ngoc,
my supervisor, who has generously given me invaluable assistance and guidance during the preparation of this graduation paper. The success of my paper would be almost impossible without her tireless support. Secondly, I would be grateful to Mrs.
Dang Thi Van,
my second supervisor, for her precious advice and encouragement. Furthermore, I own a particular debt of gratitude to Mrs.
Tran Ngoc Lien, Dean of Foreign Language Department of Hai Phong Private University for her supportive lectures and references.
In addition, my thanks also go to other teachers of Hai Phong Private University for their great contribution as well as their lecture. Last but not least, I would like to express my deepest thanks to my family and all my friends who have helped and encouraged me a lot and supplied me with material for the fulfillment of my graduation paper.
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