We would like to express our deep and sincere gratitude to our English teacher, Mrs. Atchara Bachmann, at Kanaratbumrungpathumthani School, for her detailed, valuable advice, friendly help, kind support and guidance which have been of great value in this work.
We wish to express our warm and sincere thanks to, K.P. students, who helped us to answer the questionnaires and cooperated with us for this survey.
We also wish to thank our parents for their loving support. Our loving thanks are due to everybody who helped us to finish this work.