In Britain, people have different attitudes(态度)to the police. Most people generally   1  them and the job they do, but some people said that the police shouldn’t    have special   2 .
What does a policeman actually do? It is not a(n)  3  job to describe. After all，a policeman has a number of jobs to do. A policeman often has to   4  traffic, either on foot in the centre of a town, or in a police car on the roads. Indeed，in Britain, he might be in the Traffic Police and spend a lot of time  5  up and down main roads. A traffic policeman has to help keep the traffic moving，stop speeding cars and help when there is a(n)  6  .
A policeman has to help keep the  7 ，too. If there is a fight, we  8  the police to come immediately. And they often have to deal with situation at great risk of their own  9 .
We want the police to solve crimes，of course，so an ordinary(普通) policeman,    10  he is not a detective，he will often have to help   11  criminals. And   12  do we call when there is an emergency—an air crash，a fire or an earthquake？Of course the police. So a policeman has to  13  to face any terrible emergency that may happen in the modern world.
The police do a  14  job，they do it so well that I support them. But I do not envy policemen. I do not think that I could   15  do the job of a policeman.

The bicycle is one of the simplest yet most useful inventions in the world. What is most surprising is that it was not ___1__ earlier, although the great inventor Leonardo Da Vinci had drawn pictures for bicycles and also for flying machines and some other things. Those things were not produced___2___ long after he died.
　　A person riding a bicycle uses ___3___ energy to make the bicycle move, and there is no pollution at all when you are riding. Even so, in developed ____4___, most people don’t travel to work by bicycle. It is not because the bicycles are expensive or people feel___5____ if they ride to work. It’s because __6___ cars on the roads becomes larger. It certainly becomes ___7___ to ride a bicycle. As a result, more people put their bicycles away and go to work ___8___ their cars , and in this way, the situation is made more serious.___9___ the best way to make riding safer and more popular is to create paths (开设通道) only for bicycles, and to make ___10___ so difficult and expensive for drivers to take their cars into the city that they will go back to use their bicycles.