Once a man and his Wife worked for a businessman．There was a big box in the businessman's living room．The businessman pointed at the box and said，“There's only one thing you ___1___ do．Don't open the box．” After saying．this，he ___2___ the living room．

The woman said to her husband，“There ___3___ be something expensive in the box．Let's ___4_ it，shall we?” Her husband said no to her．

The woman didn't give up her ___5___．One day，she decided to find out what was ___6___ it．Her husband didn't stop 6cr．She opened the box and looked  ___7___．She found nothing in the box and tried hard to close it，___8___ she failed．

That evening the businessman came home and found the box was ___9___．He was very angry and asked the woman and her husband to leave his home．

“But there was nothing in the box，” the woman said．“We haven’t taken anything ___10___．” The businessman shouted at them，“The box is not important．I cannot believe you．That’s important!”

1．A．needn't                  B．wouldn't              C．mustn't

2．A．entered                  B．left                      C．found

3．A．must                     B．will                      C．used to

4．A．open                     B．close                   C．clean

5．A．work                     B．ides                     C．box

6．A．near                      B．under                   C．in

7．A．inside                 B．outside                 C．up

8．A．so                         B．and                      C．but

9．A．lost                       B．open                    C．empty

10．A．at all                    B．at times                C．at once