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She __ (train) for three years before she flew into space.
had trained
They __ (work) on the spacecraft since morning.
worked
. Valentina __ (complete) her training successfully.
completed
The crew __ already __ (prepare) the equipment when the launch started
had prepared
He __ (study) astronomy for two months.
have studied
The spacecraft __ (return) safely.
returned
They __ (be) in orbit for six hours.
have been
She __ (never / see) a rocket launch before.
has never seen
The astronauts __ (repair) the station for two hours when help arrived.
had repaired
By 1963, she __ (earn) enough experience to join the mission.
has earned
The team __ (finish) the task.
has finished
They __ (check) the controls before the countdown began
had checked
The engineers __ (watch) the screens all day.
have watched
She __ (visit) many training centers
has visited
