Answer:
What did the depressed math book say to the calculator, notebook, and dictionary?
What do cows tell each other at bedtime?
What has wheels and flies but is not an aircraft?
Why donβt famous actors and actresses sweat?
What grows bigger the more you contract it?
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?