Problem: How does the sentence end?

During the child's development, the parents were required to get many books and not as many notebooks because the 
Answer: books were essential for learning.

Problem: How does the sentence end?

The credit of Sarah is much better than that of Samantha because 
Answer: Samantha is a very poor person.

Problem: How does the sentence end?

James wanted to commit adultery with a coworker when on a date but the 
Answer: adultery is a sin.

Problem: How does the sentence end?

Brett stayed home sick from school but Derrick did not because 
Answer:
Brett was in a contagious stage.