听短文，根据短文内容，判断下列句子正误，正确的用“A”表示，不正确的用“B”表示。

听短文，根据短文内容，判断下列句子正误，正确的用“A”表示，不正确的用“B”表示。
短文读两遍。

( )1. John went to work in a post office before he finished his high school.
( )2. John liked his work.
( )3. John sent letters by driving his car.
( )4. The big dog ran fast to him because he wanted to make John leave.
( )5. The big dog came to pick up the letter for its host.
( )6.The dog was a clerk in a post office.
( )7. The dog was clever.