How to connect up my xbox 360 cable to my tv with odd connections?

it only has the green blue and red sockets for the hd cables but no extra red and white for aduio so i only get a picture it has two small holes bellow them that say audio but they are to small for the cables to fit in one says for s-video the other says for pc is thier a way i am ment to use these? also if i just buy the hd cable for the tv will that just give me sound and picture with out the other coloured ones being in?