[Q]: How does the sentence end?

Gao ate a fruit graham cake instead of cheese cake because the 
OPTIONS:
- fruit Graham Cake is homemade and will go bad quickly.
- cheese cake is homemade and will go bad quickly.

[A]: fruit Graham Cake is homemade and will go bad quickly.
QUES: Continue writing.

Betty is cooking king crab legs for her friend Sarah's birthday because 

OPTIONS:
- Betty enjoys crab legs...
- Sarah enjoys crab legs...
+++++++++
ANS: Sarah enjoys crab legs...
Problem: How does the sentence end?

Traffic was heavy in the evening but had lessened by morning, as the 
OPTIONS:
- evening is when lots of cars exited the highway.
- morning is when lots of cars exited the highway.
Answer: morning is when lots of cars exited the highway.
sentence: The massage oils warmed Rachel's heart but the candles didn't do so because the  OPTIONS:
- massage oils were useful to her.
- candles were useful to her.
complete: massage oils were useful to her.
Red was the color that Laura preferred but not Maria. 
OPTIONS:
- Laura bought a shiny red sports car.
- Maria bought a shiny red sports car.
Laura bought a shiny red sports car.
Problem: Continue the following story.

You can use both flour and cornstarch to thicken soups, but the 
OPTIONS:
- flour is a less common kitchen ingredient.
- cornstarch is a less common kitchen ingredient.
Here's how I want to continue it:
cornstarch is a less common kitchen ingredient.