Problem: How does the sentence end?

It was easy to see that Erin but not Sarah was a good waitress because 
Answer: Sarah received a few tips just once a week.

Problem: How does the sentence end?

Megan had tickets to the baseball game and invited Jessica to come along.  
Answer: Jessica was thrilled with the offer.

Problem: How does the sentence end?

Logan liked to dress like a teenager even though they were the same age as Jason, so 
Answer: Logan shopped at the teen stores.

Problem: How does the sentence end?

William heard Craig needed a caretaker for a baby, so 
Answer:
William volunteered to help with it.