Problem: How does the sentence end?

Erin is considered to be much more negative than Angela, so 
Answer: Angela may be considered happy.

Problem: How does the sentence end?

Jessica called Angela on the phone to comfort them when 
Answer: Jessica found out about the news.

Problem: How does the sentence end?

Christopher had to fasten their shoes more often than Randy because 
Answer: Christopher had laces on their shoes.

Problem: How does the sentence end?

Investigator identified the crime scene with the hairs but not the fingerprints because the 
Answer:
fingerprints were sparse.