Rewrite the following passage in the passive
They had planned it as a surprise.
As they were carrying the puppy into my house, it jumped out its box.
It knocked my cake onto the floor.
Then the puppy ate half of my birthday cake!

It had been planned by them as a surpriseAs the puppy was being carryed into my house, it jumped out its box.My cake was knocked by it onto the floorThen my birthday cake was eaten by the puppy