Problem: The boy on the bike couldn't catch the boy on the skateboard, because the

My choice: bike was slower.

Problem: Donald invited Brett to Paris because

My choice: Donald didn't know how to speak the native language.

Problem: Erin jumped and clapped at the dance performed by Betty.

My choice: Betty was quite the performer.

Problem: Brian had a large collection of coins that Kevin really admired, so

My choice:
Kevin asked him for some duplicates.