Robert was a student in a high school. His father wanted him to study in a good university in the future. But the young man didn’t study hard and liked playing cards (纸牌). He had to go out after his parents fell asleep at night.

One night, when Robert came back, his father saw him. He was very angry and let him live upstairs (在楼上). Of course it was not easy for him to go out again.

Last night Robert listened carefully. When he was sure his parents went to sleep, he went out to play cards. He won some money and was very happy. When he got back, he took off his shoes and was going upstairs. He heard a noise in his parents’ bedroom. Then he saw a man came out. He knew it was a thief. He stopped him at once. The man was very afraid and gave all the things back to him.

“Tell me how you didn’t wake (弄醒) my parents up,” said Robert. “Or I’ll take you to the police station!”

（     ）51. Why did Robert have to go out after his parents fell asleep?

A. Because he had to stay at school all day.

B. Because he could play cards only when his parents fell asleep. 

C. Because he wanted to catch a thief.

D. Because his parents didn’t let him sleep at night.

（     ）52.Why did Robert’s father let him live upstairs?

A. Because he was old.

B. Because Robert didn’t like any noise.

C. Because the room upstairs was better than the one downstairs.

D. Because they could hear if Robert went out at night.

（     ）53.Robert listened carefully because he wanted to know ____________.

A. if his parents fell asleep

B. if his parents were angry

C. if there was a noise in his parents’ room

D. if there was someone outside

（     ）54.The thief gave back all the things because _________.

A. Robert was afraid

B. Robert gave him some money

C. he was afraid that Robert would take him to the police station

D. he wanted to teach Robert how to steal (偷盗)

（     ）55.Which of the statement is NOT right according to the passage?

A. Robert might not take the thief to the police station.

B. Robert’s father didn’t want his son to play cards outside.

C. Robert’s parents caught the thief in their bedroom last night.

D. Robert wanted to know how the thief didn’t wake up his parents.