Problem: Continue the following story.

During the experiment Jennifer poured the liquid into the container while Amy directed the experiment because 
Here's how I want to continue it: Amy was the senior researcher.

Problem: Continue the following story.

Brian put Lawrence in charge of preparing the baby's bottle, because 
Here's how I want to continue it: Brian wasn't confident about doing it.

Problem: Continue the following story.

Betty love to have cats but Rachel did not. 
Here's how I want to continue it:
Rachel adopted a dog at the local shelter.