They might have lost the game if they _________ (practice) so hard.
hadn't practiced
If I __________ (travel) to Europe in march, I wouldn't have returned.
had traveled
They ___________ (fall) down the stairs if you _________ (fix) them.
wouldn't have fell / fixed
He __________ (fall) in love with her if I ________ (introduce) them.
wouldn't have fallen / hadn't introduced
I __________ (gain) weight if the quarantine hadn't existed.
wouldn't have gained
She _____________ (got) that job if she ___________ (apply) for it.
wouldn't have got / hadn't applied