3. I've lost some files.

This is a statement of a problem. The most appropriate response from the given options would be one that offers help or a solution.

• A. Sorry! I didn't realise it annoyed you. (This is a response to an annoyance, not a lost item.)
• B. Actually, I'm really into classical music (This is a response to a question about music preference.)
• C. Lucky you! (This is an expression of good fortune, not relevant here.)
• D. Fire Service, please. (This is a service request, not a response to lost files.)
• E. Have you tried running a search? (This offers a practical solution for lost files.)

Ответ: E. Have you tried running a search?