1.she fat because she doesn't loes weight.

->if she

2.if he doesn' save money, he will become poor

->unless

3.my brother finds cartoon films very interesting

->my brother is

4.he didn't his homework until his father came home

->it was not

5.Nam has sold the old clothes for 2 days

-> the old clothes

6.this exercise is more difficult than that exercise

->that exercise

7.we didn't have a holiday until last year

->it was not

8.the forest fire destroyed

->many valuable trees and animals

9.the blue dress is more expensive than the red one

->the red dress