[Q]: How does the sentence end?

At the end of the class, Jason helped Lawrence because 
OPTIONS:
- Jason couldn't think of a topic for the research paper.
- Lawrence couldn't think of a topic for the research paper.

[A]: Lawrence couldn't think of a topic for the research paper.
QUES: Continue writing.

When Brenda coated her wood panels with varnish, the concrete surface beneath got stained. The varnish protected and beautified the 

OPTIONS:
- wood .
- concrete .
+++++++++
ANS: wood .
Problem: How does the sentence end?

Steven yelled at Kevin because 
OPTIONS:
- Steven was so angry after he lost the singing competition.
- Kevin was so angry after he lost the singing competition.
Answer: Steven was so angry after he lost the singing competition.
sentence: The dance instructor asked Sarah to help Rebecca practice before the show because  OPTIONS:
- Sarah didn't know the routine.
- Rebecca didn't know the routine.
complete: Rebecca didn't know the routine.
Hunter lent Joel his lucky rabbit foot because 
OPTIONS:
- Hunter was nervous about asking his crush to the prom.
- Joel was nervous about asking his crush to the prom.
Joel was nervous about asking his crush to the prom.
Problem: Continue the following story.

At the wedding, Aaron made Steven recite his vows during the ceremony. 
OPTIONS:
- Aaron was the priest.
- Steven was the priest.
Here's how I want to continue it:
Aaron was the priest.