Here are indirect versions of the direct questions:
A. I wonder if you could tell me when the next train arrives.
B. Do you happen to know what time the museum closes?
C. Could you tell me how hard it is to be an artist?
D. I was wondering when you wrote your first story.
E. Would you mind if we heard your latest song?
F. May I ask why you want this job?
G. Can you tell me how soon you can start?
H. Do you know where you live?