Problem: How does the sentence end?

I used to love quizzes in school as opposed to tests because the 
Answer: quizzes were easier.

Problem: How does the sentence end?

Mary made a cake in the oven for her cousin's birthday, but realized she messed up the cake because the 
Answer: oven was too hot.

Problem: How does the sentence end?

Lawrence wanted to take their girlfriend to dinner, but Kyle wouldn't let them. 
Answer: Lawrence couldn't get the time off.

Problem: How does the sentence end?

Sarah was constantly feeling dizzy but not Betty because 
Answer:
Sarah was experiencing symptoms of vertigo.