Based on the excerpt of the student's speech, it can be said that the rhetorical device being used is "Ethos". The excerpt is trying to make an appeal to ethics. The speaker is trying to establish his credibility by making enumeration of what he has done and what he can do.He is trying to convince the audience of his character and his capability.
A declarative sentence is also known as a statement and ends with a period. The first sentence is a question, the second one an exclamation and the third want implies an answer.
