Looking at immodestly dressed women whilst fasting

Does going out during the day in Ramadhaan to attend to one’s needs and then being struck by the immodestly dressed women [who uncover those parts of the body which are prohibited to uncover] invalidate the fast or not?

Promised to marry her if she embraced Islaam

I am the undersigned ‘Abdul-Qaadir, and I am 25 years of age. I wish to ask regarding a Christian woman who is 25 years of age; I promised her that when she becomes a Muslim I will marry her, and now she has embraced Islaam should I marry her, keeping in mind that my father is strongly against this marriage [taking place]?

Working nights as a security guard for a bank

He has been working for one of the banks for a period of ten years, and he [recently] learnt that working for banks is not permissible. He works nights as a [security] guard, and has no connection with the [trading] activities [of the bank], so can he continue working [there] or [should he] leave?