Answer: see explanation :)
Step-by-step explanation:
1. Donna sent the letter.
2. Melody received the letter.
3. The letter was written on October 5, 2017.
4. Donna's letter is a farewell or goodbye letter.
5. The main idea of the text is Donna expressing her mixed emotions about leaving and expressing gratitude to Melody.
6. The purpose of writing the letter is to bid farewell, express gratitude, and maintain a connection with Melody.
7. Donna wrote the letter because she had recently finished her postgraduate degree and was leaving for Denpasar at the end of the week.
8. Donna thanked Melody for making her time at the school enjoyable.
9. From Donna's letter, we can learn that Donna had a positive experience as an English teacher at the school, had a good relationship with Melody, and values their friendship. Donna is grateful for the unforgettable moments and the personal growth she experienced during her time at the school.