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.
