Answer:
In closing, to give you this solemn promise: if you elect me as president of the sophomore class, I'll give it my all.
Step-by-step explanation:
The correct way to rewrite sentence 26 is by adding a colon after the word "promise" and a comma after "class".
This is because, the colon is used to make a list of things or to join sentences, while the comma is used to show that the sentence is not over but there was merely a pause.