Answer:
1. The writer felt hopeful but somewhat anxious when the mail arrived.
2. Yes, the writer was expecting this letter.
3. This letter seems important because the writer feels very nervous with it and was hoping for good news.
Step-by-step explanation:
1: The writer felt hopeful but somewhat anxious when the mail arrived. His hands were shaking, he slowly took the envelope out, and he hoped for good news.
2: The writer was expecting this letter because in the text, it says "finally the letter I had been waiting for." This proves that was an expected letter.
3: The letter seems very important because, again, he felt very nervous around it and carefully analyzed and took care of the letter.
In my opinion, the letter seems like a university letter, but it could be something else.