Gail and his dog,Sam,are standing at the street corner .They're waiting

Gail and his dog,Sam,are standing at the street corner .They're waiting
Gail and her dog,Sam,are standing at the street corner.They're waiting for the cars to go by.They want to go __36__ the street.She is waiting for Sam to decide when they cross.
__37__ blind people use special,trained (受过训练的) dogs to help them tell when and where they would go.But not every dog can do__38__.A dog for the blind must be clever.The dog must be __39_ at a special school.He is taught to walk __40__ the trainer's legs.He is taught to walk __41__ his trainer does.
The blind __42__ goes to the school,too.He practices with the dog.He holds the leather belt (皮带) around the dog's neck tightly.__43__ he feels the dog's movements and knows when and where to __44__.
At the street corner Sam doesn't watch the __45__.It's not because he's careless.It's just because dogs can't __46__ red lights from green ones.He is trained to watch the cars,and tell _47__ the time is for him and Gail to cross.
Sam is __48__ to Gail.He does her seeing for her.He keeps her __49__ danger.But Sam is not only Gail's __50__.He's her best friend,too.
( )36.A.through B.over C.across D.past
( ) 37.A.Any B.All C.No D.Some
( ) 38.A.one B.it C.these D.those
( ) 39.A.told B.asked C.trained D.helped
( ) 40.A.close to B.far from C.in front of D.behind
( ) 41.A.faster than B.slower than C.not so fast as D.as fast as
( ) 42.A.man B.person C.child D.woman
( ) 43.A.In this way B.By the way C.On the way D.Along the way
( ) 44.A.jump B.run C.walk D.drive
( ) 45 .A.people B.policemen C .traffic lights D.cars
( ) 46.A.speak B.talk C.say D.tell
( ) 47.A.when B.what C.where D.which
( ) 48.A.polite B.kind C.important D friendly
( ) 49.A.in B.out of C.with D.inside
( ) 50.A.eyes B.ears C.hands D.feet