完形填空，阅读下面的短文，用方框中所给单词的适当形式填空，使文意通顺、正确。（每个单词限用一次）

(should   use    dangerous  habit   spend    much    safely    at    it    although)

Overhead bridges are found in many parts of Lanzhou, especially in places where traffic is heavy and crossing the road is very ____.

The purpose of these overhead bridges is to enable passengers to cross road ____ . Overhead bridges are used in very much the same way as zebra crossings. They are more efficient ____less convenient because people have to climb up a long flight of steps. This is inconvenient especially to old people. When passengers are ____a zebra crossing, traffic is held up. This is why the government has built many overhead bridges to help passengers and to keep traffic moving____the same time.

The government of Lanzhou has  ____lots of money in building these bridges. For their own safety, passengers ____be encouraged to use them instead of risking their lives by running across the road. Old people, however, may find ____a little difficult climbing up and down the steps, but it is still ____safer than walking across the road with all the dangerous of moving traffic.

Overhead bridges serve a very useful purpose. Passengers, both old and young, should make a  ____to use them. This will prevent unnecessary accidents and loss of life.​