Question: actually we are quite sure that this would be the first time ever.
Answer: --> Actually we are quite sure that this would be the first time ever.

Question: emphasize on your long-term interest in the company and say that you expect that a good action will open new opportunities at the company.
Answer: --> Emphasize on your long-term interest in the company and say that you expect that a good action will open new opportunities at the company.

Question: have been to classical music concert for more than a month ago
Answer:
--> Have been to classical music concert for more than a month ago