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13. You ............... (go) to Jack's house but he wasn't there. He .........(go out) .
14.I. ......... (invite) Lucy to the party but she couldn't come. She.......(arrange) to do something else.
15. I ......(prepare) dinner before my friend........(arrive) yesterday evening.
16. They.........(finish) the discussion one hour before Steve........(change) his mind. ​