Flop - fine, I dont think checking here would get you any more action later.

Turn: SB can be on almost any hand, 8x, 55,44 whatever really.

River: SB wakes and you probably have lost. I would still call the river - I'm sure that enough players on this limit would be bettin with something smaller (TT maybe?) than straight here. You only have to be right occasionally for this call to be right.