Задание №80992 ЕГЭ Английскому языку

Преобразуйте, если это необходимо, слово «HAPPEN» так, чтобы оно грамматически соответствовало содержанию текста.

In 1999, Time magazine named Einstein as the Person of the Century.
No one could have guessed this __________________ when he was at school.  He was extremely interested in science but hated the system of learning by heart. He said it destroyed learning and creativity. He had already done many experiments, but failed the entrance exams to a technical college.