Problem: How does the sentence end?

Sarah had some urgent info to tell so made a text message for Kayla telling them all about it. 
OPTIONS:
- Sarah is the sender.
- Kayla is the sender.
Answer: Sarah is the sender.

Problem: How does the sentence end?

Monica has much better handwriting than Felicia because 
OPTIONS:
- Monica really took the time to practice their cursive skills.
- Felicia really took the time to practice their cursive skills.
Answer: Monica really took the time to practice their cursive skills.

Problem: How does the sentence end?

It was easier to sleep on the cot than the bed because the mattress on the 
OPTIONS:
- cot was hard.
- bed was hard.
Answer: bed was hard.

Problem: How does the sentence end?

Erin is driving Betty to the airport in the morning to catch the flight. 
OPTIONS:
- Erin prepares the car by filling the tank.
- Betty prepares the car by filling the tank.
Answer:
Erin prepares the car by filling the tank.