题目内容：

    Gail and her dog, Sam, are standing at the street corner. They’re waiting for the cars to go by. They want to go _________ the street. She is waiting for Sam to decide when they should cross.

Some 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 ______. A dog for the blind must be clever. The dog must be ________ at a special school. He is taught to walk close to the trainer’s legs. He is taught to walk ________ his trainer does.

The blind person goes to the school too. He practices with the dog. He holds the leather belt（皮带）around the dog’s neck tightly（紧紧地）. In this way he feels the dog’s movements and knows when and where to _______.

At the street corner Sam doesn’t watch the _______. It’s not because he’s careless. It’s just because dogs can’t _______ red lights from green ones. He is trained to watch the cars, and tell when the time is for him and Gail to cross.

Sam is _____ to Gail. He does her seeing for her. He keeps her _____ danger. But Sam is not only Gail’s _______. He’s her best friend, too.

1.A. through B. over C. across D. past

2.A. one B. it C. these D. those

3.A. told B. asked C. trained D. helped

4.A. faster than B. slower than C. not so fast as D. as fast as

5.A. jump B. run C. walk D. drive

6.A. people B. policemen C. traffic lights D. cars

7.A. speak B. talk C. say D. tell

8.A. polite B. kind C. important D. friendly

9.A. in B. out of C. with D. inside

10.A. eyes B. ears C. hands D. feet