根据短文内容及首字母填空。

     Overhead bridges can be seen in many parts of Singapore, in the places where traffic is very 1.h  

and crossing the road is not safe. These bridges can help people cross roads 2.s .Overhead bridges

are used in very much the same way as zebra crossings(斑马线).They are more efficient(效率高的),

3.t   less convenient(方便的)because people have to climb up a lot of steps. This is inconvenient to

the old. When people 4.u    an overhead bridge, they do not hold up(阻挡) traffic. But when they

cross a busy road using a zebra crossing, traffic is held up. This is 5.w     the government(政府)has

built many overhead bridges to help people and 6.k traffic moving at the same time. The government

of Singapore has 7.s   a lot of money building these bridges. For their own safety, people should be

advised to use them instead of rushing across the road. Old people may find it a little 8.d   climbing up

and down the steps, but it is still much safer than walking across the road 9.w   all the moving traffic.

Overhead bridges are very useful. People, both old and young, should always use them. This will stop

accidents from 10.h   .