Question: What is the name of the track that hosted the Swedish Grand Prix in 1979?
SQL: SELECT "Track" FROM "2-17231558-1" WHERE "Year" = '1979';

Question: What year did Barry Sheene win the 125 cc?
SQL: SELECT "Year" FROM "2-17231558-1" WHERE "125 cc" = 'Barry Sheene';

Question: Who won the 250 cc in 1987?
SQL: SELECT "250 cc" FROM "2-17231558-1" WHERE "Year" = '1987';

Question: At what track resulted in Fausto Gresini winning the 125 cc and Carlos Lavado winning the 250 cc?
SQL: SELECT "Track" FROM "2-17231558-1" WHERE "125 cc" = 'Fausto Gresini' AND "250 cc" = 'Carlos Lavado';

Question: Who won the 250 cc in 1985?
SQL: SELECT "250 cc" FROM "2-17231558-1" WHERE "Year" = '1985';