Overhead bridges(天橋)can be seen in many parts of Singapore because traffic is very heavy and crossing the road is  1  ．

    Overhead bridges are very useful，although they are not very convenient(方便的)because people  2  climb up a lot of steps．This is not convenient to the  3  ．But if people cross a  4  road using a zebra crossing(斑馬線)，traffic is busy．This is  5  the government has built many overhead bridges to help people and  6  traffic moving at the same time．The government of Singapore has  7  a lot of money building these bridges because they are much sifter．

1．A．danger                   B．dangerous             C．safe

2．A．can                       B．may                     C．have to

3．A．young                   B．old                      C．deaf

4．A．Wide                     B．Winding               C．busy

5．A．how                      B．when                    C．why

6．A．see                        B．keep                    C．find

7．A．used                      B．made                   C．spent