Problem: How does the sentence end?

Laura helped Christine with their exercises, as 
Answer: Christine didn't know how to stretch muscles  for warming up.

Problem: How does the sentence end?

Lawrence was alerted romantic feelings from Robert so 
Answer: Robert tried to find ways to ask them out.

Problem: How does the sentence end?

They needed more cushions on the chair than the sofa because the 
Answer: sofa was softer.

Problem: How does the sentence end?

Cynthia thought rabbits were cute but Tanya was allergic to them. 
Answer:
Tanya got a cat as a pet.