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At the age of six, they (started / have started) their own production company, becoming the yongest Hollywood producers in history.
They (appeared / have appeared) in Full House for eight years. The show finaly (ended / has finaly ended) in 1995.
They (published / have published) their first book about twelve years ago: so far, their books (sold / have sold) more than 30 million copies and (make / have made) more than $130 million