Problem: How does the sentence end?

In order to practice Taekwondo, he punched the bag instead of the wall. The 
OPTIONS:
- bag was softer.
- wall was softer.
Answer: bag was softer.

Problem: How does the sentence end?

I used lotion more than I used the soap because the 
OPTIONS:
- soap would dry out my skin.
- lotion would dry out my skin.
Answer: soap would dry out my skin.

Problem: How does the sentence end?

The nails that I bought to construct the desks did not work, because the 
OPTIONS:
- nails were too dull.
- desks were too dull.
Answer: nails were too dull.

Problem: How does the sentence end?

Tabatha wanted to be a medical doctor and got the right books but left out the materials because the 
OPTIONS:
- books were on sale.
- materials were on sale.
Answer:
books were on sale.