Usually unstressed "О" is pronounced as "A", and unstressed "E" - as "i".
КорОва sounds like "karOva", молокО sounds like "malakO", гОрод sounds like "gOrad".
рекА sounds like "rikA", прекрАсно sounds like "prikrAsna".
Г - is g, but the endings "...ого", " ...его" are pronounced as "...ava" (or "...ova", depending on the stress), "...eva".
Не вижу голубОго нЕба - sounds like "ni vizhu galubova neba".