根據(jù)文意，補(bǔ)全所缺單詞，詞首字母已給出。

　　Overhead bridges can be seen in many parts of Singapore，in the places where traffic is very h _____ and crossing the road is not safe.

　　These bridges can help people cross roads s _____ .Overhead bridges are used in very much the same way as zebra crossings(斑馬線).

　　They are more efficient(效率高的)，t _____ less convenient(方便的)because people have to climb up a lot of steps.This is inconvenient to the old.When people u _____ an overhead bridge，they do not hold up(阻擋) traffic.But when they cross a busy road using a zebra crossing，traffic is held up.This is w _____ the government(政府)has built many overhead bridges to help people and k _____ traffic moving at the same time.

　　The government of Singapore has 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 d _____ climbing up and down the steps，but it is still much safer than walking across the road w _____ all the moving traffic.

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

　　Key:

　　1.heavy

　　2.safely(作狀語應(yīng)用副詞形式)

　　3.though(此處表讓步關(guān)系，意為“雖然”)

　　4.use

　　5.why(此處表達(dá)“這就是……的原因)

　　6.keep

　　7.spent(spend time /money in /on doing sth.意為“花時(shí)間/金錢做某事”，其中in常省略)

　　8.difficult

　　9.with

　　10.happening(stop...from doing)意為“阻止/防止……去做某事”)

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