阅读下面材料,在空白处填入适当的内容(1个单词)或括号内单词的正确形式。 Overhead bridges are now very common in cities. They are often built in places {#blank#}1{#/blank#}traffic is heavy and crossing the road is very dangerous.
Overhead bridges are used in {#blank#}2{#/blank#} same way as zebra crossing. They both serve a very useful purpose-to allow people{#blank#}3{#/blank#} (cross) the road safely and prevent unnecessary accidents and the loss of life. However, overhead {#blank#}4{#/blank#} (bridge) are more efficient when compared with zebra crossing. When people are crossing a zebra crossing, traffic is held up. {#blank#}5{#/blank#} the other hand, overhead bridges can help people cross the street without disturbing the traffic. One disadvantage of overhead bridges is {#blank#}6{#/blank#} people have to climb up steps. This is not very {#blank#}7{#/blank#} (convenience), especially to old people.
Many overhead bridges {#blank#}8{#/blank#} (build) over the years. For their own safety, people should be encouraged to use them instead of risking their life by {#blank#}9{#/blank#} (run) across the road. Old people may find {#blank#}10{#/blank#} difficult to climb up and down the steps, but at least it is much safer than walking across a road filled with dangerous moving traffic.