[Q]: How does the sentence end?

The shoes had more traction on the gym floor than on the grass because the 
OPTIONS:
- grass was dry.
- floor was dry.

[A]: floor was dry.
QUES: Continue writing.

Samantha's recent health has been a very big problem unlike Monica's because 

OPTIONS:
- Samantha was diagnosed with cancer.
- Monica was diagnosed with cancer.
+++++++++
ANS: Samantha was diagnosed with cancer.
Problem: How does the sentence end?

Carrie usually borrowed tools from Jennifer because 
OPTIONS:
- Carrie lacked very durable equipment for the tasks.
- Jennifer lacked very durable equipment for the tasks.
Answer: Carrie lacked very durable equipment for the tasks.
sentence: The games that Randy played were easier than Dennis's because  OPTIONS:
- Randy was a talented individual.
- Dennis was a talented individual.
complete: Dennis was a talented individual.
William took out a doll to conjure a voodoo curse to make Robert suffer because 
OPTIONS:
- William felt betrayed by him.
- Robert felt betrayed by him.
William felt betrayed by him.
Problem: Continue the following story.

When training at the gym, my instructor recommended the roller over the mat for pricing as the 
OPTIONS:
- roller was more expensive to use.
- mat was more expensive to use.
Here's how I want to continue it:
mat was more expensive to use.