Problem: How does the sentence end?

The smell of the food did not come from the vegetables, but from the spices, as the 
Answer: vegetables were bland.

Problem: How does the sentence end?

Ryan made Nick recite mathematical formulas for the test, because 
Answer: Ryan is his math tutor.

Problem: How does the sentence end?

The cow stopped eating grass and started munching on grain, since the 
Answer: grass was unpalatable.

Problem: How does the sentence end?

Aaron went to go on a vacation to Hawaii without Joel because 
Answer:
Joel was busy with work.