    Seatence. 2: Government bonds sold off sharply-after’ Greenspan. told  Congress. on:Tuesday that the US. ecciiomy. * coald'very’ well be  embaikiig ona périedf extended growth”.    Seitencé:2: Greenspan-tatd Congress on, Tuesday the US..econdmy."  could very well be embarking oriaperid ofsustained growth”.         