Problem: How does the sentence end?

Jessica wants to clean colored grout so she asks her friend Rebecca for help, because 
OPTIONS:
- Jessica doesn't know how to do it.
- Rebecca doesn't know how to do it.
Answer: Jessica doesn't know how to do it.

Problem: How does the sentence end?

Mary was a more reckless driver than Rachel, and 
OPTIONS:
- Mary got a lot of traffic tickets.
- Rachel got a lot of traffic tickets.
Answer: Mary got a lot of traffic tickets.

Problem: How does the sentence end?

Victoria asked Kayla where she bought the two new jigsaw puzzles but 
OPTIONS:
- Victoria couldn't remember.
- Kayla couldn't remember.
Answer: Kayla couldn't remember.

Problem: How does the sentence end?

Mary poured the entire chocolate milk jug into her drinking cup until the 
OPTIONS:
- jug was empty.
- cup was empty.
Answer:
jug was empty.