[Q]: How does the sentence end?

It was easy for Felicia but not Laura to win the race because 
OPTIONS:
- Felicia ran very quickly.
- Laura ran very quickly.

[A]: Felicia ran very quickly.
QUES: Continue writing.

I enjoyed the park a lot better than the old run down zoo, because the 

OPTIONS:
- zoo had less things to do.
- park had less things to do.
+++++++++
ANS: zoo had less things to do.
Problem: How does the sentence end?

Susan was making a cake for a party and she had an egg but didn't have milk. It was necessary to go to the store for the 
OPTIONS:
- egg .
- milk .
Answer: milk .
sentence: The ceremony was going on so long that the guests were getting frustrated with the participants, because the  OPTIONS:
- participants were known to stall.
- guests were known to stall.
complete: participants were known to stall.
Amy asked Megan if she liked the taste of cucumbers but 
OPTIONS:
- Amy had never had one.
- Megan had never had one.
Megan had never had one.
Problem: Continue the following story.

Erin kept a close watch on Laura, but 
OPTIONS:
- Erin knew exactly what they were up to.
- Laura knew exactly what they were up to.
Here's how I want to continue it:
Laura knew exactly what they were up to.