The type of language that would be most appropriate for the presentation will be:
The most appropriate language that Mr. Raphael should use will be the one that is reflective of the setting and his audience. While it is true that Mr. Raphael is encouraging the students to do something fun, he should also recall that the setting is a school and it is not appropriate for teachers to use informal language with their students within this environment.
The fair is still a learning platform and to communicate and attain the best results, it will be wise of Mr. Raphael to use formal language. The teacher-student relationship must not be disturbed or changed by the use of informal language. So, it is appropriate to always consider context and setting during communication.
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