Table: euro_motor_gp
Columns: year
designated_grand_prix
track
250_cc
350_cc
500_cc
report

Question: What year did Freddie Frith win the 350cc and Enrico Lorenzetti win the 500cc?
SQL: SELECT "year" FROM euro_motor_gp WHERE "350_cc" = 'freddie frith' AND "500_cc" = 'enrico lorenzetti'

Question: What track was used in 1926?
SQL: SELECT "track" FROM euro_motor_gp WHERE "year" = '1926'

Question: Who won the 250cc in 1927?
SQL: SELECT "250_cc" FROM euro_motor_gp WHERE "year" = '1927'

Question: What grand prix was held at Granollers?
SQL: SELECT "designated_grand_prix" FROM euro_motor_gp WHERE "track" = 'granollers'

Question: Who won the 350cc at Sachsenring?
SQL: SELECT "350_cc" FROM euro_motor_gp WHERE "track" = 'sachsenring'