There are many traffic signs on a highway， and drivers must know them well and follow them strictly. If you __1__ a sign， you may get into trouble.
A policeman was sitting in his car on the side of Highway 25 __2__ to catch speeders. After all， it was his duty to keep law and order on the road. After a while， a car full of elderly women slowly rolled by. The policeman realized that the slow-moving car was a __3__ to other drivers on the highway， __4__ he decided to pull them over. He turned on his siren(警报) and lights and rushed to the slow-moving car and then __5__ behind the car， which had stopped on the side of the road __6__ the driver noticed the police car.
The policeman got out and approached the car to __7__ to the driver. He said， “The speed __8__ on this highway is fifty-five miles per hour. Why are you driving so __9__?”
“Well， officer， I’ve seen a lot of signs on this highway that __10__ ‘twenty-five’ not ‘fifty-five’，” the old woman politely replied.
“Ma’am，” the officer __11__ the driver， “Those aren’t speed signs. Those signs __12__ that you are driving on Highway 25.”
“Oh， __13__ me. I didn’t know. I’m sorry， officer. I’ll be more __14__ in the future，” she replied.
Then the police officer looked in the __15__ of the car. He noticed that the __16__ passengers looked very scared and were shaking with __17__. The officer asked the driver， “What’s __18__ with them? They look like they’ve been frightened to death by __19__.”
The driver replied， “Oh， they will be all right in a minute or two. You see， we just __20__ Highway 120.”
