Problem: How does the sentence end?

In the chess game, the rook piece took the opponent's knight piece since the 
Answer: knight piece was at a disadvantage.

Problem: How does the sentence end?

Angela attended a private school, while Emily attended a public school, because 
Answer: Emily had middle class parents.

Problem: How does the sentence end?

Chet and his friends went to the diner instead of the bar because there was more space at the 
Answer: diner .

Problem: How does the sentence end?

Carrie kept a journal for 10 years but then stopped while Samantha kepti at it for 20 years, because 
Answer:
Carrie got too busy.