Упр 272.Передайте следующие предложения в passive voice.

13. I don't think all the preparations shall be finished today. 14. I'am always invited to her denner parties by her. 15. The dress made by Shot's daughter was showed to me by Shot. 16. The matter was discussed some days ago( by us). 17. You're wanted on the phone( by someone). 18. Her book was found on the window-sill( by her).