Problem: How does the sentence end?

Jason built a better website for the contest than Justin because
Answer: Jason is a better programmer.

Problem: How does the sentence end?

To get rid of the fleas in his carpet, the man used chemicals rather than powders because the
Answer: chemicals were useful.

Problem: How does the sentence end?

Dennis loved the event that he went to last weekend unlike Leslie because
Answer: Leslie got wet from rain.

Problem: How does the sentence end?

Joel's friends were all busy while Derrick's friends were available, so
Answer:
Joel went to the concert alone.