It is quite reasonable to blame traffic jams, the cost of gas and the great speed of modern life, but manners on the road are becoming horrible. Everybody knows that the nicest men would become fierce tigers behind the wheel. It is all right to have a tiger in a cage, but to have one in the driver's seat is another matter.

    Road politeness is not only good manners, but a good sense. It takes the most cool-headed drivers great patience to give up the desire to beat back when forced to face rude driving. On the other hand, a little politeness goes a long way towards reducing the possibility of quarreling and fighting. A friendly nod or a wave of thanks in answer to an act of politeness helps to create an atmosphere of good will and becomes so necessary in modern traffic conditions. But such behavior of politeness is by no means enough. Many drivers nowadays don't even seem able to recognize politeness when they see it.

    However, misplaced politeness can also be dangerous. A typical example is the driver who waves a child crossing the street at a wrong place into the path of oncoming cars that may not be able to stop in time. The same goes for encouraging old ladies to cross the road wherever and whenever they want to.

An experienced driver, whose manners are faultless, told me it would help if drivers learnt to correctly join in a traffic stream without causing total blockages that give rise to unpleasant feelings. Unfortunately, modern drivers can't even learn to drive, let alone master the roadmanship (公路驾车技能). Years ago, experts warned us that the fast increase of the car ownership would demand more give-and-take (互谅互让) from all road users. It is high time for all of us to take this message to heart.

读短文，从每题所给选项中选出可以填入空白处的最佳选项。

    Ever since I was a child, my mouth has caused me trouble. I'm not a bad person; I have a 1 time learning when to keep my mouth closed.

    My mom has told me again and again, "Robert, your constant bad words are hurting me. If you 2 to be this rude, you will get into big trouble."

    It's been a problem at school several times too when teachers have told me something I didn't want to hear. I used to feel it was my duty(职责) to 3 myself.

    One day in English class I began working on my homework until I heard a classmate 4 behind me. It was Nathaniel, who liked doing that as usual.

    At first, I said very 5, "Nathaniel, would you please be quiet?"

    However, Nathaniel continued talking to himself. I quickly 6 "Nathaniel, shut up(闭嘴)!"

    For the next five minutes, we threw hurtful(伤感情的) words back and forth at each other.

    "At least I don't have an ugly lazy eye like you!" I shouted.

    I knew this would make him 7. It would hurt his feelings and shut him up.

    What I said filled him with anger. He tried to 8 over my seat and catch me as he shouted, "That's it! That's it!"

    9 at his reaction(反应), I sat back in my seat. I had never seen Nathaniel act like this before.

    Later on, we were taken to the principal's office. There, Mr. Black, our English teacher, told us to 10 the matter. It wasn't until then that I finally found that 11 I hurt someone physically(身体上), the wounds eventually heal(愈合). But when I hurt them with my 12, sometimes the pain (痛苦) never goes away.

    At the end of the discussion, I said 13 to Nathaniel.

    When I went back to my room, I spent some time praying(祈祷). I began to 14 how often what I said hurt others. But I believe that as I keep praying and asking God to help me, he'll tell me when to keep my 15 closed.

关于温度、热量、内能，以下说法正确的是（   ）