Historical clue formulations

• "Jeopardy!" response: Abbr. — 2013-03-20
• Topic for debate: Abbr. — 2011-07-14
• Survey part: Abbr. — 2007-06-29
• Opposite of an ans. — 2005-02-21
• Who, what or where sentence: Abbr. — 2000-02-21
• Opposite of an ans. — 1999-11-24
• Opposite of an ans. — 1999-01-25
• Inquiry: Abbr. — 1996-07-14