Problem: How does the sentence end?

Joan was trying to decide what to wear between her tank top or sports bra. She went with the 
Answer: sports bra since she was going running.

Problem: How does the sentence end?

Her child had dropped the birthday cake onto the floor, and she was upset because the 
Answer: floor is dirty.

Problem: How does the sentence end?

I was unable to store the cake in the container since the 
Answer: container was too small.

Problem: How does the sentence end?

Less animals fit in the cage than the barn because size of the 
Answer:
barn was bigger.