Answer: Good.
Greatly should not be used in this context, and goodest is not a real word. so good would be the answer.
Explanation:
C) verbs and adverb phrases
Hey there,
The answer is fact.
Hope this helps :))
<em>~Top♥</em>
I believe it is the introduction which should be relatively brief. You shouldn't prolong it too much, because the emphasis should be put on the main part of your speech, and not so much on the introduction.