Bridges are built for many reasons. Some bridges are built so that cars     (cross) over rivers. Others are made for trains to use . In Washington State, there is a very unusual bridge. It was built for squirrels(松鼠) 。
The town of Longview has a very busy street. Many cars pass it every day. When squirrels tried to cross the street, they     (kill) . Amos Peters wanted     (protect) these small and lovely animals, so he built a bridge for them---one that would let them pass above the traffic.
The bridge  (be)  a symbol of the town for over 40 years since then. And every Christmas, the local people  (add) a small Christmas tree to the center of the bridge ,How lovely!
A few years ago, the local people   (create) a squirrel festival and they raised money   (build)  two more bridges for these lovely animals. For years, because of the bridges . the squirrels in the town have been able to cross safely from one side of the street to the other.