Major indexes tumbled after a long holiday weekend as investors fretted over Greece's ability to repay its debts, its future in the eurozone, and a surge in the dollar. That brought down the price of oil, gold, and other commodities, which are priced in dollars. The industrial, oil and gas, and materials sectors were all broadly lower. Only a handful of stocks posted gains. Time Warner Cable rose 7.26 percent after it agreed to be acquired by Charter Communications for $55 billion. Charter rose 2.54 percent. A big question for investors is when the Federal Reserve will make its first interest rate increase in almost a decade. Many observers expect that to occur either later this year or early next year. ''If you think Greece is actually in its last throes in the eurozone it's better to be safe and park your money in US dollars and deal with the Fed's interest rate increase down the road,'' said Quincy Krosby, a market strategist at Prudential Financial. US government bond prices rose sharply, sending yields lower. Wholesale gasoline, heating oil, and natural gas prices fell amid the stronger dollar. Precious and industrial metals also ticked lower.