Paul and I live in the same building．His room is on the sixth floor but mine is on the fifth．He is very careless and sometimes he gets into trouble．

　　Last Friday afternoon the young man and his friends went to spend the weekend on a wild island．They could swim， fish， play the guitar（吉他） and sleep in the quiet place at night．They enjoyed themselves there．On the third morning they decided to get back to the land．But their boat hit a rock and soon went down．With the villagers' help， they swam to the bank．Luckily none of them was hurt．They took a taxi and half an hour later they arrived at our town，but it was two in the night．The young man was hungry and thirsty．He wished to get home as soon as possible．Since something was wrong with the lift，he had to go up the stairs（楼梯）．He stopped by my door and brought out a key．Of course he could not open the door．Half an hour passed but failed．He became angry and shouted，“I'll cut you down with a knife．”

The noise woke me up and I opened the door．I understood at once what was happening and said，“You're trying to open a wrong door，Paul！”

　　“Sorry，I can't agree with you．Charlie！” said the young man．“It's my room．You've entered it by mistake！”

1．Paul and his friends enjoyed themselves on the island because________．

A．it was very quiet there

B．there were many fish there

C．they could forget all the trouble

D．they could do what they wanted

2．Paul couldn't open the door because________．

A．it wasn't his room

B．he couldn't find the right key

C．he didn't find the keyhole

D．he was too hungry to do it

3．Which of the following is wrong？

A．Paul thought he did right．

B．Paul didn't think he did right．

C．Paul stopped by a door on the fifth floor．

D．Paul thought he had reached the sixth floor．

4．What can we learn from the passage?

A．Never take a wrong key．

B．Be careful when going out．

C．More haste，less speed．

D．Be friendly to your neighbours．