sentence: Joey was careful when he passed by the tack but he managed to scratch himself on the nail because the  OPTIONS:
- tack was dull.
- nail was dull.
complete: tack was dull.

sentence: The children love reading the book but they do not seem to like the magazine because the  OPTIONS:
- book is attractive.
- magazine is attractive.
complete: book is attractive.

sentence: The grease on the bridge caused the car to slide off, but the truck stayed in control, as the  OPTIONS:
- car had such superior traction.
- truck had such superior traction.
complete:
truck had such superior traction.