Historical clue formulations

• Country in which English and Mandarin are official languages — 2015-01-13
• Asian country in which English is an official language — 2006-06-25
• Asian city-state — 2004-10-19
• City on a strait — 2004-09-29
• Port on the Strait of Malacca — 2001-07-18
• Literally, "lion city" — 2000-08-26
• "Road" destination of 1940 — 1998-05-29