Seoul shares ended lower Monday to extend their losing streak to a fifth day amid concerns that the US Federal Reserve may not cut its rate by a large margin. The Korean won traded sharply lower against the US dollar. The benchmark Korea Composite Stock Price Index lost 8.35 points, or 0.33 percent, to close at 2,535.93. Trading volume was moderate at 262.46 million shares worth 7.3 trillion won ($5.4 billion), with gainers outnumbering losers 502 to 371. Foreigners sold a net 540 billion won wo