Образуйте от прилагательных превосходную степень 1.a great invention 2.an interesting experiment 3.available building materials 4. an independent decision 5.an outstanding scientist 6. skilled engineers 7. a secure structure 8.a warm seasons

1.the greatest invention
2.the most interesting experiment 
3.the most available building materials
4.the most independent decision
5.the most outstanding scientist
6.the most skilled engineers
7.the most secure structure
8.the warmest seasons