Riddle: How do you know when your alarm clock is hungry?
Answer: When it goes back four (for) seconds. 
Riddle: What time does a duck get up?
Answer: At the quack of dawn. 
Riddle: What time does a tennis player get up?
Answer: Ten-ish.
Riddle: How do bees get to school in the morning?
Answer: On the school buzz.
Riddle: I am used to bat with, yet I never get hit. I am near a ball, yet it is never thrown. What I am?
Answer: Eyelashes .
Riddle: Only two back bones and a thousand ribs. What am I?
Answer: Railroad track.
Riddle: You serve me but never eat me. What am I?
Answer: A tennis ball.
Riddle: What gets whiter the dirtier it gets? What is it?
Answer: A chalkboard. 
Riddle: What do you throw out to use and take in when you're done?
Answer: An anchor.
Riddle: What is the difference between a coat and a baby?
Answer: The one you wear, the other you were.