sentence: The party is at 7:00 and I need to catch the train at 9:30, so there isn't much time. Luckily, the 
complete: train was late, so it worked out.

sentence: Donald put the frame up on the wall for Adam because 
complete: Adam was too short to reach it.

sentence: Megan borrowed Betty's new  slippers because her feet were cold but 
complete:
Betty forgot to ask for the slippers back.