Answer:
The prepositions in this sentence, “Early this morning we set the instruments on the table, and now we’re waiting for our teacher,” are OR and FOR
Step-by-step explanation:
Preceding a pronoun or a noun and linking it with another word is the chore of a preposition. Its role is vital because it adds a spec of meaning to a sentence just like other parts of speech do.
Here, “on” is preceded by the noun “table” and links it with the other word “instruments.” Similarly, “for” is preceded by the noun “teacher” linking it further with other words like “waiting” and the pronoun “we.”