comparative degree

This painting is _________than his.
1. Good
2. Better
3. the best
This sofa is _________in this shop.
1. The best
2. Good
3. Better
The everest is _________mountain in the world.
1. higher
2. the most high
3. the hightest
Miss Siwaphon is ________teacher in Srisuk Witthaya School.
1. beautifuler than
2. more beautiful than
3. the most beautiful
Adam is twelve years old. Sarah is ten years old. Sarah is ______ Adam.
1. The yourngest
2. younger than
3. youngest than