Which Surface has a Partner of jim thomas, and a Date of 2007?
CREATE TABLE "doubles_15_9_6" (
  "outcome" text,
  "date" real,
  "surface" text,
  "partner" text,
  "opponents_in_the_final" text,
  "score_in_the_final" text
);
SELECT "surface" FROM "doubles_15_9_6" WHERE "partner"='jim thomas' AND "date"=2007;