QUES: Continue writing.

The company built the structure using steel but not iron because the 

OPTIONS:
- steel was costly.
- iron was costly.
+++++++++
ANS: iron was costly.
Problem: How does the sentence end?

Megan has recently bought a rat with respiratory disease from Christine and now 
OPTIONS:
- Megan need help.
- Christine need help.
Answer: Megan need help.
sentence: Betty helped Monica with some last minute studying because  OPTIONS:
- Betty had made terrible grades on the last tests.
- Monica had made terrible grades on the last tests.
complete: Monica had made terrible grades on the last tests.
She wanted to exfoliate her face with cleanser but it had crushed walnut shells in it so she used a brush instead.  The 
OPTIONS:
- cleanser was gentle on her skin.
- brush was gentle on her skin.
brush was gentle on her skin.
Input: Continue writing.

Amy wanted a darker shade of paint than Mary so 
OPTIONS:
- Amy had to apply several coats.
- Mary had to apply several coats.

Continued: Amy had to apply several coats.
[Q]: How does the sentence end?

Following the advice from the chef, Mary used a wooden cutting board to cut meat instead of a plastic cutting board, even though the 
OPTIONS:
- wooden cutting board is porous.
- plastic cutting board is porous.

[A]:
wooden cutting board is porous.