CREATE TABLE table_69665 ("Round" FLOAT, "Date" CLOB, "Grand Prix" CLOB, "Circuit" CLOB, "125cc winner" CLOB, "250cc winner" CLOB, "MotoGP winner" CLOB, "Report" CLOB)

Name the circuit for round 18
SELECT "Circuit" FROM table_69665 WHERE "Round" = '18'
SELECT "Circuit" FROM "table_69665" WHERE "Round" = '18'