Answer:
I listed multiple questions for the problems, and all of them seem polite to me.
Step-by-step explanation:
1. Do you mind if I borrow this?
May I please borrow this?
Is it alright if I borrow this?
2. Is it alright if I leave my bag here?
Do you mind if I leave my bag here?
3. Would it be possible to give me another worksheet?
May I please have another worksheet?
4. Would it be alright to open the window?
Would it be possible to open the window?
5. Would it be possible for you to turn the music down?
I was wondering if it might be alright to turn the music down?
6. I was wondering if it might be possible for you to lend my friend money?
Would it be alright for you to lend my friend money?