Which statement is more formal than the others?

1.   ?    Can I borrow your pen?
2.   ?    Is it Ok to use your phone?
3.   ?    Do you mind if I use your CD player?

Which statement is less formal than the others?

1.   ?    I was wondering if you'd mind lending me your car?
2.   ?    Would you mind letting me use your laptop?
3.   ?    I wonder if I could borrow some money?

Which is the most correct way of asking a friend, whom you have known for 6 years, for some chocolate?

1.   ?    Would you mind if I ate some of your chocolate?
2.   ?    Is it Ok if I eat some of your chocolate?
3.   ?    Can I eat some of your chocolate?

Which is the most correct way of asking a boss for a holiday from work?

1.   ?    Can I have a holiday for 2 weeks in June?
2.   ?    Is it Ok if I have 2 weeks holiday in June?
3.   ?    I was wondering if I could have 2 weeks holiday in June?