四、完形填空。
During a physics class, the teacher asked, “Why do we have brakes（刹车）in our cars?”
One student stood up and said, “Sir, to 1 the car.”
Another student 2, “To check the car’s speed（速度）.”
The students kept giving similar answers, so the teacher decided to share his own thoughts.
He said, “I appreciate（欣赏）all of your answers. However, I see it a bit 3. Brakes in a car allow us to drive faster.”
The students were 4. No one had expected this answer.
The teacher continued, “Imagine if our cars had no brakes. How fast would we be willing to drive? It’s actually the brakes that 5 us to drive quickly and reach our destination（目的地）safely.”
The class stopped short. They had never considered brakes this way.
Smiling, the teacher went on 6, “In life, we also have ‘brakes’. Our parents, teachers and friends may sometimes ask us about our goals, our progress and our decisions. We often see their questions as challenges that hold us 7. But what if we saw these questions as brakes in cars? These ‘brakes’ help keep us safe while we are taking risks. Sometimes, we just need to stop or 8 take a step back, so we can make a big leap forward（巨大的飞跃）. Without these ‘brakes’, we would have no way to avoid losing our way or facing 9 accidents in life.”
So, we need to understand that the 10 in our lives are not there to stop us. They are there to help us move forward faster and more safely, so we can reach our goals.
()1. A. stop B. start C. repair D. clean
()2. A. tested B. added C. raised D. recorded
()3. A. easily B. clearly C. quickly D. differently
()4. A. worried B. tired C. shocked D. relaxed
()5. A. suffer B. throw C. aid D. lie
()6. A. himself B. herself C. themselves D. ourselves
()7. A. on B. up C. off D. back
()8. A. ever B. never C. even D. still
()9. A. small B. unfortunate C. necessary D. interesting
()10. A. joys B. failures C. successes D. challenges

1. A
2. B
3. D
4. C
5. C
6. A
7. D
8. C
9. B
10. D