When you are in England, you must be very careful in the streets because the traffic drives on the left. Before you cross a street, you must look to the right first and then left. If the traffic lights are red, the traffic must stop. Then the people on foot can cross the road. If the traffic lights are green, the traffic can go. People on foot mustn't cross. In the morning and in the evening when people go to or come from work, the streets are very busy. Traffic is most dangerous then. When you go by bus in England, you have to be careful, too. Always remember the traffic moves on the left. So you must be careful. Have a look first or you will go the wrong way. In many English cities, there are big buses with two floors. You can sit on the second floor. From there you can see the city very clearly. It's very interesting. When you are in England, you must always remember that  _  .
there are many cars and buses on the road. the traffic drives on the left. there are not any traffic lights. the traffic drives on the right.