Edition: Singapore Indonesia Asia US/UK HOUSTON :Oil prices fell 1 per cent on Monday after touching a five-month high as markets tried to gauge the impact on transit of oil and gas via the Strait of Hormuz after U.S. airstrikes against Iran at the weekend. Brent crude futures were down 70 cents, or 0.9 per cent, at $76.31 a barrel by 10:46 a.m. ET (1446 GMT). U.S. West Texas Intermediate crude (WTI) fell 76 cents, or 1 per cent, to $73.09. Earlier in the session, Brent and WTI touched five-