10．
When you are in England you must be very careful in the streets __41__ the traffic goes on the left. Before you cross a street you must look to the right first __42__ then the left. In the morning and in the evening when people go to or come from __43__, the streets are very busy. Traffic is most _____44____ (danger) then.
When you go by bus in England, you have to be careful, __45__. Always remember the traffic___46___ (move) on the left. So you must be careful. ___47__(have) a look first, or you will go the wrong way.
In many English cities, there are big buses __48__ two floors. You can sit on the __49__ (two) floor. From __50___ you can see the city very well. It’s very interesting.