Problem: How does the sentence end?

Kayla believed rats were disease carriers but Felicia didn't so 
Answer: Felicia interacted with the pet rat.

Problem: How does the sentence end?

Doctor gave some medicine to Betty but gave none to Tanya as 
Answer: Tanya was showing none of the symptoms of illness.

Problem: How does the sentence end?

Rachel let Elena go to the event at the club in her place. 
Answer: Rachel liked to avoid those kind of places.

Problem: How does the sentence end?

Justin excitedly told Robert that he was going to take up auto racing as a career.  
Answer:
Robert was worried for him.