murmuring

"He is a student of life."

"My friend told me there was something in the box, but I didn't know what it was yet. "

"The student's discontent with the course material was evident in her low grades. "

"The CEO made a public apology for the scandal, and promised full cooperation with the authorities."

"The teacher embarrassed the student by publicly calling out a wrong answer during the quiz. "

"Given that "indistinguishable" is an adjective, not a noun, here's a sentence using it correctly as an adjective: "The twins were so alike that their voices were almost indistinguishable." "

"My complaint about the noisy neighbors was finally heard by the landlord. "

"the murmurings of trees in the wind"

"The teacher announced that there would be no school tomorrow due to the snow. "

"The presentation about the new school rules was very clear and easy to understand. "

"The beggar muttered words of thanks, as passersby dropped coins in his cup."

"Joe was always complaining about the noise made by his neighbours."