阅读短文，并从各题所给的选项中，选择最佳选项．

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 mustn't do．Don't open the box．"After saying this，he（41） 　　the living room．

The woman said to her husband，"There（42） 　　something expensive in the box．Let's（43） 　　it，shall we？"Her husband said no to her．

The woman didn't give up her（44） 　　．One day，she decided to find out what was（45） 　　it．Her husband didn't stop her．She opened the box and looked（46） 　　．She found nothing in the box and tried hard to close it，（47） 　　she failed．

That evening the businessman came home and found the box was（48） 　　．He was very angry and asked the woman and her（49） 　　to leave his home at once．

"But there was（50） 　　in the box．"the woman said．"We haven't taken anything at all．"The businessman shouted at them，"The box is not important．I cannot believe in you．That's important!"

41．A．entered	B．left	C．found	D．arrived
42．A．must be	B．has	C．lived	D．have
43．A．buy	B．close	C．clean	D．open
44．A．home	B．idea	C．boss	D．children
45．A．near	B．under	C．in	D．on
46．A．beside	B．outside	C．up	D．inside
47．A．so	B．and	C．but	D．or
48．A．lost	B．open	C．empty	D．closed
49．A．husband	B．son	C．daughter	D．businessman
50．A．nothing	B．something	C．anything	D．everything．