Superlatif d'infériorité

Fill in the blanks
Mettre les adjectifs ou adverbes entre parenthèses à la forme du superlatif de supériorité:
1. This problem is (important) of all.
2. I am (young) in my family.
3. They are (beautiful) children.
4. She is (tall) in her family.
5. This lesson was (interesting) that we ever had.