Answer :
AS THEIR PARENTS HAD TO KEEP THE SECRET FROM HIS SON THAT HIS FATHER IS A PROFESSIONAL BOXER .
AND IN LINE 3
AS HAROLD WAS NOT INTERFERING AND DOUBTING ABOUT THE FATHER'S PROFESSION HIS FATHER WAS TO PARTICIPATE IN THE LAST MATCH SO HE SECRETLY CAME AND WENT MYSTERIOUSLY THROUGH THE BACK DOOR OR ANY OTHER FOR THE PRACTICE FOR THE LAST MATCH WITHOUT KNOWING TO HAROLD .
AND IN LINE 3
AS HAROLD WAS NOT INTERFERING AND DOUBTING ABOUT THE FATHER'S PROFESSION HIS FATHER WAS TO PARTICIPATE IN THE LAST MATCH SO HE SECRETLY CAME AND WENT MYSTERIOUSLY THROUGH THE BACK DOOR OR ANY OTHER FOR THE PRACTICE FOR THE LAST MATCH WITHOUT KNOWING TO HAROLD .