从下列方框中选出正确词的适当形式填空。
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When you are in England, you must be very careful in the streets because the traffic drives on the left. Before you __1 __a street, you must look to the right first and then to the left.
In the morning and in the __2 __ when people go to or come back from work, the streets are very __3__. Traffic is the most dangerous then.
When you go by bus in England, you have to be careful, too. Always remember the traffic __4 __ on the left. So you must be careful. Have a look first, or you may go the wrong way.
In many English cities, there are big buses with two floors. You can sit on the __5__ floor. From there you can see the city very well. It’s very interesting.
1.________ 2.________ 3._______ 4.________ 5.__________