Problem: How does the sentence end?

Aaron wanted to have a jazz career like Leslie, but 
Answer: Aaron had a worse voice than them.

Problem: How does the sentence end?

Eric was constantly harassing Kevin at work but he never responded.  
Answer: Eric was very angry.

Problem: How does the sentence end?

Benjamin received a raise at work before Neil did because 
Answer: Neil isn't a very hard worker.

Problem: How does the sentence end?

Girls always seem to ignore Robert, and give all the praise to Steven, so 
Answer:
Robert is likely immature.