Change the verbs into the correct form (have [has / had] done).
①) Ken knew the town quite well。 He ( visit ) it many times.
) Misa (just go ) to the department store. She wont come back for a while.
(3) We first met ten years ago, so we ( know ) each other for more than half our lives.
4)) Alex dropped his tablet and broke it. He ( buy ) it just the day before.