Problem: Continue the following story.

Cynthia got her period a lot later than did Natalie. So, 
Here's how I want to continue it: Cynthia likely went through puberty a little later.

Problem: Continue the following story.

Tanya was excited to be on the quiz show while Jennifer was not because 
Here's how I want to continue it: Jennifer was very shy.

Problem: Continue the following story.

Lawrence always got nervous when they were around Adam, because 
Here's how I want to continue it:
Lawrence tended to by shy.