I want to show my sincere thanks to my thesis advisor. Teacher, Mrs. Watri Saensingchai for the help of her valuable and encouraging continued throughout the period of this research. I am very thankful for the instruction and guidance of her not only how to research, but also how much more in life. I will not succeed this far and this thesis would not have been done without all the support that I received from her always. In addition, I am grateful for the teachers of the Department of English. Professor Mr. Donlawat Chaichompoo, Professor and teacher Mrs. Jongrak Na si others for advice and assistance on all of them. Finally, I am most grateful acknowledgement to my friends for all their support throughout the duration of this research.
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