综合填空：

Many rules govern drivers on American streets and highways．The most o　　1　　 ones are the speed limit(限制)．On streets in the city, the speed limit is u　　2　　 25 or 35 miles per hour．On the highways b　　3　　 cities, the speed limit is usually 55 mph．When people drive f　　4　　 than speed limit, a p　　5　　 can stop them．He gives them pieces of paper which people call traffic tickets．Traffic t　　6　　 the drivers how much money they must pay．When drivers receive too many tickets, they probably cannot drive for a w　　7　　．The rush hour is when people are going to work or going home f　　8　　 work．At rush hour there are many cars on the streets and traffic moves very slowly．Nearly all American cities have rush hours．Drivers do not get tickets very often for s　　9　　 the rush hours b　　10　　 they cannot drive fast．