sentence: Kevin had to check Ian's carseat when they reached the airport, because 
complete: Kevin was the adult.

sentence: Tom wanted a piece of candy but he had not done the chores his mom asked him to do today.  Tom did the 
complete: chores quickly to have the candy.

sentence: The cats scurried out of the tub and made for the warm blanket, since the 
complete:
tub was very uncomfortable.