CREATE TABLE table_21757 ("Year" FLOAT, "Network" CLOB, "Play-by-play" CLOB, "Color commentator" CLOB, "Sideline reporters" CLOB, "Pregame host" CLOB, "Pregame analysts" CLOB)

What pregame host was on espn and had taylor twellman color commentating?
SELECT "Pregame host" FROM table_21757 WHERE "Network" = 'ESPN' AND "Color commentator" = 'Taylor Twellman'
SELECT "Pregame host" FROM "table_21757" WHERE "Color commentator" = 'Taylor Twellman' AND "Network" = 'ESPN'