First, I would like to express my sincere and special gratitude to Mrs. Nguyen
Thi Yen Thoa, my supervisor, who gave me invaluable assistance and guidance
during the preparation for this graduation paper.
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My thanks also go to Mrs. Tran Thi Ngoc Lien, the dean of Foreign Language
Department of Hai Phong Private University for her precious advice and
encouragement
I also would like to thank all the teachers of Foreign Language Department
of Hai Phong Private University for their suggestions to my paper.