1) Appropriate (adj) - It is not appropriate to use your cell phone during class.
Definition- belonging to or peculiar to a person; proper:

2) Focus (verb) - Students need to focus on their teacher's lesson if they want to pass their classes.
Definition-  Consentrate

3) Consist (verb) - A great meal consists of salmon, mashed potatoes, and asparagus
Definition- to be made up or composed