Problem: How does the sentence end?

Nelson had lots of new ideas, but not Robert because 
Answer: Robert was not very original in thought.

Problem: How does the sentence end?

Joel spends a lot more time sitting down than Donald because 
Answer: Joel works in an office.

Problem: How does the sentence end?

At the gym, Kevin followed Derrick 's lead during the exercise routine. 
Answer: Kevin was his student.

Problem: How does the sentence end?

I'm getting a dog as a pet and I'm going to buy it a bowl before a leash because the 
Answer:
bowl is more useful.