听力原文： City Hall officials have announced that City Hall will be open on Saturday this week in order to accommodate citizens who are filing their tax forms at the last minute. The Revenue Office will be open in the morning only, from eight A.M. until noon. Long lines are expected, so it is suggested that you arrive early in order to avoid them. You can also avoid lines by filing before Saturday. Send your tax return in by mail before the end of this week. Tax returns sent by mail must be postmarked on or before Saturday of this week in order to avoid late penalties. When will the Revenue Office in City Hall be open?