CREATE TABLE "table1_16617025_1" (
  "series_num" real,
  "season_num" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "u_s_viewers_millions" text
);

Question: What episode titles have 17.93 million U.S. viewers?
SQL: SELECT "title" FROM "table1_16617025_1" WHERE "u_s_viewers_millions"='17.93';

Question: What episode titles have 20.94 million U.S. viewers?
SQL: SELECT "title" FROM "table1_16617025_1" WHERE "u_s_viewers_millions"='20.94';

Question: In what seasons did Kate Woods direct Without A Trace?
SQL: SELECT "season_num" FROM "table1_16617025_1" WHERE "directed_by"='Kate Woods';

Question: Who wrote Season 8?
SQL: SELECT "written_by" FROM "table1_16617025_1" WHERE "season_num"=8;