At Harton College—an English boarding school for boys —there are many rules . 15-year-old Bob Sanders often breaks them .
The boys can go into the town in the afternoon after class . But they must return to the school at six o’clock . One afternoon Bob walked to the town . He looked at the shops and then went to the cinema . After the film , he looked at his watch . It was after eight o’clock . He was a little worried . He walked back to Harton College as fast as possible .
When he arrived , he ran quickly to the main entrance . It was locked . He went round the school building to another door , which was locked too . He looked up at the window of his dormitory on the third floor . The window was open . But it was quite dark , and he could not climb up the wall easily . Then he saw another open window on the ground floor . It was the window of the headmaster’s study .
He looked into the room —no one was there . Bob quickly climbed on to the window sill（窗台）and jumped into the room . Just then he heard a noise . Then someone turned on a light in the corridor（走廊）. Bob looked around and then hid under the sofa . One minute later , Mr. Mannering , the headmaster , came in . He turned on the light on his desk , and sat down on the sofa . Then he opened a book and began to read .
Bob lay under the sofa as quietly as possible . He couldn’t move . The floor was cold and uncomfortable . He looked at the headmaster’s shoes and socks for an hour .
“Why doesn’t he get up and go to bed ?” Bob thought .
Mr. Mannering read his book for another hour . Finally , the headmaster closed his book and stood up .He put the book on a shelf and walked towards the door .
“Thanks heavens , he didn’t find me under the sofa ,” thought Bob .
Then Mr. Mannering stopped and spoke towards the sofa . “ Would you turn off the light when you leave ?” He said , and left the study .
1．Bob didn’t go to his dormitory because______________.
A．its door was locked
B．the window was shut
C．it was quite dark
D．the wall was too high for him to climb up
2．Who had turned on a light in the corridor ?
A．Bob himself    B．Another pupil     C．An office clerk        D．Mr. Mannering
3．When the headmaster came in , Bob______________.
A．was sitting on the sofa
B．was lying under the sofa
C．hid himself behind the bookshelf
D．hid himself under the sofa
4．It can be inferred that Mr . Mannering ______________.
A．knew that Bob was still at the cinema
B．knew that Bob was in the dormitory
C．knew exactly where Bob was
D．didn’t know clearly where Bob was