Which situation has an original u.s. airdate of December 5, 2007?
CREATE TABLE "table1_14570857_1" (
  "num" real,
  "episode_title" text,
  "situation" text,
  "date_of_situation" text,
  "nature_of_situation" text,
  "original_u_s_airdate" text
);
SELECT "situation" FROM "table1_14570857_1" WHERE "original_u_s_airdate"='December 5, 2007';