Congress cast a financial lifeline to school districts this week with the passage of $10 billion in aid meant to keep teachers in the classroom and out of the unemployment lines. School boards across Pennsylvania now look to Washington, D.C., with open arms but a wary eye. Never ones to turn down cash, districts nonetheless will be caught between pressure from teachers unions to restore jobs and the reality that they will not be able to afford much new spending after the money is gone. "I don't see the longer-term fiscal problems of Pennsylvania going away," said C. Kent McGuire, dean of the College of Education at Temple. "What's important is that school districts don't use this money and assume that in 24 months everything will be back to normal."