Answer:
Step-by-step explanation:
Seven
Don't get caught believing it is goodest. Good is irregular. Much as I like goodest, the answer is best.
Eight
only if you are using earnest as an adjective, can you have earnest in a comparative sense. earnester would be one choice. A better one in my opinion is more earnest.
Sam is more earnest than Albert.
Sam is earnester than Albert.
The spell check underlines earnester. I think it's right to do so. This is an example of tortured language.
Nine
Narrowest.
Ten
nicer.
Sam is nicer than Albert.