Problem: How does the sentence end?

Elena can prepare the dinner for us but don't ask Betty as 
OPTIONS:
- Elena is an mediocre cook.
- Betty is an mediocre cook.
Answer: Betty is an mediocre cook.

Problem: How does the sentence end?

Emily has a chronic diarrhea so she goes to doctor Betty for an advice, because 
OPTIONS:
- Emily feels miserable.
- Betty feels miserable.
Answer: Emily feels miserable.

Problem: How does the sentence end?

The giant hamburger was placed into the microwave on the counter because the 
OPTIONS:
- microwave was cold.
- hamburger was cold.
Answer: hamburger was cold.

Problem: How does the sentence end?

Robert wanted carpeting on the floor and Eric didn't because 
OPTIONS:
- Robert knew that vacuuming was easier than sweeping.
- Eric knew that vacuuming was easier than sweeping.
Answer:
Robert knew that vacuuming was easier than sweeping.