21. Who isn't your sister and isn't your brother, but is still a child of your mother and father?

　　I myself.

　　22. What has teeth but cannot eat?

　　A comb.

　　23. What kind of man can raise things without lifting them?

　　A farmer.

　　24. Why does time fly?

　　To get away from all the people who are trying to kill it.

　　25. Name five days of the week without saying: Monday, Tuesday, Wednesday, Thursday, Friday.

　　The day before yesterday, yesterday, today, tomorrow, and the day after tomorrow.

　　26. What animal eats and drinks with its tail?

　　All do. No animal takes off its tail when eating and drinking.

　　27. What has a soft bed but never sleeps, a big mouth but never speaks?

　　A river.

　　28. What kind of dog never bite?

　　A hot dog.

　　29. Why does the Statue of Liberty stand in New York Harbor?

　　Because it can't sit down.

　　30. What did one invisible man say to the other invisible man?

    It's nice not to see you again.