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Though the Greek debt crisis has faded from the spotlight for the moment, Greece remains in deep recession, and uncertainty lingers. Unions throughout Europe are protesting cuts in benefits, making it difficult for governments to rein in their spending.

Leadership questions are also surfacing, with the Greek finance minister stepping down to run the majority Socialist party and France gearing up for presidential elections.

At a conference Sunday in Beijing, International Monetary Fund chief Christine Lagarde said that European leaders need to stay vigilant about debt.

“The world economy has stepped back from the brink, and we have causes to be a little bit more optimistic,” she said. “But optimism should not give us a sense of comfort and certainly should not lull us into a false sense of security.”

The price of oil climbed above $108, up almost a dollar for the day. The average price for a gallon of regular gasoline rose a penny over the weekend to $3.84 and is up 30 cents in a month, pushed higher by tension in Europe over Iran’s nuclear program.

Among other U.S. stocks making moves:

• Citigroup rose 3 percent after announcing it had sold its share in a Shanghai bank, a possible sign the bank will try to establish its own businesses in China. Like many of its peers, Citi is slimming down to try to shake off the vestiges of the financial crisis.

• Sprint Nextel plummeted 7 percent after an analyst downgraded the stock to underperform, predicted that future incarnations of the iPhone will not work too well with the Sprint network and expressed concern about the company’s debt.

• Bank of America rose above $10 in midday trading for the first time since August, though it’s still well off its pre-crisis high of more than $50.

• Gap rose 3 percent after it said it plans to open stores in Johannesburg and Cape Town, South Africa, this week, its first stores in southern Africa.