Problem: Continue the following story.

We decided to order diamonds for our new engagment rings instead of rubies, since the 
Here's how I want to continue it: diamonds were attractive.

Problem: Continue the following story.

Her anxiety was high at the airport but lower at the train station, since the 
Here's how I want to continue it: airport was so noisy.

Problem: Continue the following story.

The cancer has stopped since the patient took the medicine compared to the therapy since the 
Here's how I want to continue it:
therapy was ineffective.