Problem: How does the sentence end?

The boy tried lots of different medicines to cure his pimples but the 
OPTIONS:
- pimples were too weak.
- medicines were too weak.
Answer: medicines were too weak.

Problem: How does the sentence end?

Tammy used her writing software to help her write a cover letter but the 
OPTIONS:
- cover letter was too difficult.
- software was too difficult.
Answer: software was too difficult.

Problem: How does the sentence end?

Craig set up traps in order to catch rats for Michael, because 
OPTIONS:
- Craig needed traps from because their house was infested.
- Michael needed traps from because their house was infested.
Answer: Michael needed traps from because their house was infested.

Problem: How does the sentence end?

The better blogger was voted for and Justin won over Dennis because 
OPTIONS:
- Justin was more thoughtful.
- Dennis was more thoughtful.
Answer:
Justin was more thoughtful.