Problem: How does the sentence end?

Monica was helping Emily to lose weight because 
Answer: Emily was obese now and needed help.

Problem: How does the sentence end?

Benjamin was able to complete the typing exercise faster than Dennis, because 
Answer: Dennis had little experience.

Problem: How does the sentence end?

The bathroom smelled better than the kitchen did because the leak was in the 
Answer: kitchen .

Problem: How does the sentence end?

Nick was having his wisdom teeth out, so Christopher drove him to the dentist.  
Answer:
Christopher was glad to help.