(1) I have no idea about who this book belongs to.
(2)Mr Brown came to China in search of a better future.
(3)He took apart two old chairs to make a sofa.
(4)John mentioned a few names of the judges which he didn't think highly of.
(5)There's no doubt that the search for the lost relics will continue.（你是不是把no doubt打成了on doubt?）
(6)The two countries were at war,and troops (of them?) were sent to front.(troops of不知道想怎么用这里）
(7)She gave me some food and cloth but asked nothing in return.