Overhead bridges can be seen in many Parts of Singapore，in the places where traffic is very  41 and crossing the road is not safe.
These bridges can help people cross roads  42  . Overhead bridges are used in very much the same way  43  zebra crossings.
They are more efficient(效率高的)，thou  44  convenient(方便的)because people have to climb up a lot of steps．This is inconvenient to the old. When people use an overhead bridge，they do not  45  traffic. But when they cross a busy road using a zebra crossing, traffic is kept back. This is  46  the government has built many overhead bridges to help people and keep traffic moving at the same time.
The government of Singapore has spent a lot of money  47  these bridges. For their own safety, people should be advised to use them instead of rushing across the  48  . Old people may find it a little difficult to climb up and  49  the steps, but it is still much safer than walking across the road with all the moving traffic.
Overhead bridges are very  50  . People，both old and young，should always use them. This will stop accidents from happening.

A．easy B．heavy C．hurry D．free

A．safely B．quietly C．fast D．slowly

A．from B．to C．across D．as

A．more B．much C．less D．little

A．hold up B．put up C．hold on D．get on

A．why B．what C．how D．where

A．protecting B．repairing C．building D．buying

A．bridge B．road C．step D．bus stop

A．down B．away from C．on D．towards

A．great B．useful C．beautiful D．especial