Problem: How does the sentence end?

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

Problem: How does the sentence end?

Randy had always recycled their plastic but Ian did not because
Answer: Randy was environmentally responsible.

Problem: How does the sentence end?

At the wedding, Carrie convinced Samantha to dance with them after
Answer: Samantha promised to follow.

Problem: How does the sentence end?

Justin went to check on Christopher at their dorm, but no one was there.
Answer:
Christopher was not available.