Problem: Continue the following story.

When they were getting pets, Jessica wanted a lizard and Jennifer wanted a dog, because 
Here's how I want to continue it: Jessica was allergic to dogs.

Problem: Continue the following story.

He couldn't fit his belongings in the case and had to use a sack instead, since the 
Here's how I want to continue it: sack was great in volume.

Problem: Continue the following story.

We wanted to go and take the plastic to the dump instead of all of the wood, because the 
Here's how I want to continue it:
plastic is lighter.