Надо вставить в 3 пропуска одно и тоже слово. ann left the engine ответ while she delivered the parcel. i’m surprised to hear the governor of the state is for president. i’ve had that tune through my head ever since i heard it last week.

Ann left the engine going while she delivered the parcel.
I’m surprised to hear the Governor of the state is going for President.
I’ve had that tune going through my head ever since I heard it last week.

going также можно заменить на running, тогда во втором предложении смысл изменится с "претендовать на пост Президента" на "включиться в борьбу на пост Президента"