sentence: He laid a rubber mat down on the concrete driveway while working on his car since the surface of the 
complete: concrete is hard.

sentence: Eric put out his electrical fire with baking soda, while Craig tried water. The house of 
complete: Craig burned down.

sentence: Rachel had fun at the slumber party but Erin had a bad time, 
complete:
Rachel was talkative and kept everyone up all night.