Who wrote the episode that had 6.05 million U.s. viewers?
CREATE TABLE "table1_28037619_2" (
  "no" real,
  "title" text,
  "directed_by" text,
  "written_by" text,
  "original_air_date" text,
  "production_code" real,
  "u_s_viewers_million" text
);
SELECT "written_by" FROM "table1_28037619_2" WHERE "u_s_viewers_million"='6.05';