Most Asian-Pacific markets fell Monday amid concerns that the U.S. might default on its debt. Japan's Nikkei 225 gave up 1.2%. Hong Kong's Hang Seng Index fell 0.7%. Australia's S&P/ASX 200 lost 0.9%. South Korea's Kospi slid 0.1%. India's Sensex was down 0.1%. Bucking the trend, China's Shanghai Composite rose 0.7%.