Complete the sentences with the correct form of adjectives in the brackets: 1) The sun is (bright) ... than the moon. 2) The moon is not so (bright) ... as the sun. 3) This is the (difficult) ... lesson

Complete the sentences with the correct form of adjectives in the brackets. 
1. The sun is (bright) ... than the moon.
2. The moon is not so (bright) ...as the sun. 
3. This is the (difficult) ... lesson. 
4. Autumn is the (fine) ... season of the year. 
5. He is the (good) ... boy at mathematics in this class. 
6. In math I am (bad) ... than in English. 
7. This is my (old ) ...brother, he is the (old) ... child in my family. 
8. Lan is (pretty) ... than her younger sister.