Task 2. Which of these do NOT refer to a semi-formal thank-you letter? 1. I am writing to ... 2. I appreciated ... 3. What helped me most of all ... 4. It was kind of you ... 5. Thank you very much 6. As for ... 7. I'm so grateful for... 8. I thought I'd drop you a line. 9. Thanks a million! 10. It was good of you...