Listen to the audio in order to complete the gaps with the preposition you hear

Elon Musk was born June 28, 1971, Pretoria, South
Africa. a child, Musk was so lost his daydreams
about inventions that his parents and doctors ordered a
test to check his hearing.

about the time of his parents’ divorce, when he was 10,
Musk developed an interest computers.
He taught himself how to program, and when he was 12 he sold his first software: a game he created called Blastar.
grade school, Musk was short, introverted and bookish. He was bullied he was 15 and went through a growth spurt and learned how to defend himself with karate and wrestling.

Musk’s mother, Maye Musk, is a Canadian model and the oldest woman to star in a Covergirl campaign. When Musk was growing , she worked five jobs one point to support her family.
Musk’s father, Errol Musk, is a wealthy South African engineer.
Musk spent his early childhood his brother Kimbal and sister Tosca in South Africa. His parents divorced when he was 10.

age 17, 1989, Musk moved Canada to attend Queen’s University and avoid mandatory service the South African military. Musk obtained his Canadian citizenship that year, part because he felt it would be easier to obtain American citizenship via that path.

1992, Musk left Canada to study business and physics the University of Pennsylvania. He graduated an undergraduate degree economics and stayed for a second bachelor’s degree physics.

leaving Penn, Musk headed to Stanford University California to pursue a PhD in energy physics. However, his move was timed perfectly the Internet boom, and he dropped out Stanford after just two days to become a part of it, launching his first company, Zip2 Corporation 1995. Musk became a U.S. citizen 2002.