What would you change about yourself if you could?

What is the meaning of the word checking as it is used in this sentence from the second paragraph of the passage?

Who calls tyler into his office to fire him his job

Key events - what happens? what do we learn about the character in this event? or how does the event change the character? what is the author’s message in each set of events you have identified? 1.bruno and his family move from berlin to auschwitz due to the move he learns of the camp which leads to another key event. 2.bruno meets shmuel when they meet, they become friends which in turn towards the end leads to their untimely demise.