1 . It is ____________thought to be a plant of Africa, but no one knows exactly the ____________ of this plant, because we don’t have any ____________ material about it.(origin)

2 . After his death the house was back to its ____________ (origin) owner.

3 . This is not a copy but an ______（最初的）painting by Picasso.

4 . Our ________ (原来的) plan was to see a film at the cinema that afternoon. (根据汉语提示单词拼写)

5 . I think you should go back to your ________ (原先的，最初的) plan. （根据汉语提示单词拼写）

6 . A second study was performed in 1973 to update the __________ (origin) report.

7 . I think you should go back to your o_________ plan, which is much more practical than the present one. （根据首字母单词拼写）

8 . I never suspected for a minute that you should doubt my _________ intentions, and is this how you reward me for my help? （origin）（所给词的适当形式填空）

9 . We were astonished to find the old temple built 300 years ago was still in its   ________ (起初的) condition.(根据汉语提示单词拼写)

10 . The gallery showcases some_________________（原作的）European and American paintings dating back to the Baroque era of the 17th century. (根据汉语提示填空)