Paul was going to be late for his morning class again.

Paul was going to be late for his morning class again. He _________NOT/UNDERSTAND_________ why it happened to him so often. This was going to be the _________THREE_________ time in one week and that was too much even for Mrs Pitt. She was the _________KIND_________ teacher in the world but Paul wasnt sure that she would forgive him again.
If I dont invent a very good excuse, she ________CALL__________ my parents. Paul thought.
His parents _________NOT/BE________ very strict people but they didnt approve of Pauls habit of playing computer games till late at night. As a result, he couldnt make _________HE_________ get up in the morning and was regularly late for school. Paul quietly opened the door and _________GO_________ into the classroom. His classmates _________WRITE_________ something in their notepads and didnt pay any attention to him.
Mrs Pitt looked at him and said in a flat voice: You are late again, Paul. What _________HAPPEN_________?
Paul was not ready with an answer.