Срочно!Помогите 25 баллов!When Larry Walters was a teenager, he saw/was seeing

Безотлагательно!Помогите 25 баллов!
When Larry Walters was a teenager, he saw/was seeing
some balloons while he did/was doing
the shopping one day. He thought/was thinking
about using them to fly, but he didn't try/wasn't trying
the idea until twenty years later. He was asking/asked
his girlfriend and a friend to tie 45 balloons to a garden chair which he was sitting/sat
in. Then they filled/were filling
the balloons with helium. Immediately, Larry rose/was rising
to a height of 3,600 m and he was very frightened. Then he noticed that the chair went/was going
towards Los Angeles Airport. Fortunately, he came/was coming
down three-quarters of an hour later before he reached the airport.