Mr Smith had a small shop in a town. There were many beautiful things made of gold in the shop. He often stood at the door and called, “Come and see! Come and buy! I’ll show you beautiful things made of gold（金子）.”
One day Mr Smith had to go out to do something important. He said to his son, “I’m going out to do something, and you must stay here. Don’t leave the door of the shop.” When Mr Smith left the shop, he told his son again, “Don’t leave the door of the shop. Do you remember?” “Yes, I understand,” answer his son.
Half an hour later, Mr Smith came back. “What happened? Why are there so many people coming into or going out of my shop?” he said to himself in surprise.
He looked for his son here and there. He saw his son playing under a tree behind the shop. Mr Smith ran to the boy and said, “I told you not to leave the shop.” “No, you told me not to leave the door. I did as you told me. I didn’t leave the door of the shop. I took it down and brought it with me. Look! Here is the door!”
根据短文内容，回答下列问题。（每题1分，共5分）
( ) 81.Mr Smith often _______ in his shop.
A. called people to buy things B. gave people things
C. bought things from people D. did something important
( )82.Mr Smith told his son, “Don’t leave the door of the shop.” means “________”.
A. The door of the shop is gold. B. Someone wants to take off the door
C. Look after the shop D. Look after the door of the shop
( )83.Mr Smith worried about his shop, so he came back___________.
A. half an hour later B. after forty minutes
C. before thirty minutes D. after an hour
( )84. People came into his shop and _______.
A. looked for Mr Smith B. looked after his shop
C. bought something from it D. took something away from it
( )85. Mr Smith’s son___________.
A. didn’t understand his words B. understood his words well
C. didn’t leave the door of the shop D. did as he told him