Answer:
Why did the teacher have to wear sunglasses?
Why do most married men die before their wives?
What do you call a fish without an eye?
Why did the bread, muffin, cookie and graham crackers go to see a doctor?
What do cows tell each other at bedtime?
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?