Problem: How does the sentence end?

In the kitchen, Rebecca was excited about the smell of cheese, while Emily gagged. 
Answer: Emily was not used to the smell.

Problem: How does the sentence end?

Elena gave advice to Sarah about being in a good relationship, and 
Answer: Sarah listened to their advice.

Problem: How does the sentence end?

Windows computers was the best for Erin but Felicia preferred Apple Mac. 
Answer: Erin had used PCs since they were a child.

Problem: How does the sentence end?

Megan wanted to buy a new pet from Rebecca so 
Answer:
Rebecca showed what tropical fish she had for sale.