谁能帮我回答下下面的英语问题?

改写：为被动句,双重所有格.1,One of my records were borrowed by him .2,one of John's pictures were showed by her 3,One of her ideas was it 4,On my desk found One of your letters 5,Some friends of theirs came to see me Is you watch made of gold?（看得出）用什么做成.these knives were made in Sheffield.在哪里做成 This cake was made by sugar,flour.butter and eggs （看不出）用什么做成.will you enter for Many athletes have entered enter 本身就是及物动词,有进入,参加,从事...的意思,通常后面跟实意名词,例如enter the classroom ,enter the war ,enter politics ...enter for,是加入,开始从事；开始参加的意思..例：entered for the competition 但是类,请注意,它后面也可以跟抽象名词,例如,XXX带我进入了一个新的领域...