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22、One day after school the teacher says to his students，“Tomorrow morning，if anyone of you can answer my first question．he or she can go home early．”

The next day，when the teacher comes into the classroom，he finds the blackboard is very dirty．He is very angry and asks，“Who did（做）it? Please stand up!”“It’s me，”says Bob，“Now I can go home．Good bye，sir．”

1．Bob is the teacher’s ________．

A．son                        B．brother                   C．student                  D．friend．

2．Bob makes ________ dirty．

A．the blackboard         B．the window            C．the chair                D．the desk

3．The teacher is very angry because ________．

A．the classroom is very clean                          B．the blackboard is very dirty．

C．Bob doesn’t stand up                                  D．Bob can answer his first question

4．The angry teacher tells the student to ________．

A．stand up                                                    B．sit down

C．go home                                                   D．clean the blackboard

5．Which one is right?

A．It is good for Bob to do it．                         B．Bob is late for school．

C．Bob goes home early every day．                 D．Bob is a naughty（淘氣的）student．