41. What can you swallow that can also swallow you?

　　Water.

　　42. What's the difference between a hill and a pill?

　　A hill is hard to get up and a pill is hard to get down.

　　43. Why is it useless to send a letter to Washington?

　　Because he's dead.

　　44. A doctor and a lawyer loved the same girl. The lawyer went away for a week and gave the girl seven apples before he left. Why?

　　Because an apple a day keeps the doctor away.

　　45. What will you do if a man-eating tiger is running after you?

　　Nothing. Because I'm a woman.

　　46. What always travels on foot?

　　A shoe.

　　47. Where can happiness always be found?

　　In the dictionary.

　　48. What is higher without a head than with a head?

　　A pillow.(枕头)

　　49. Why don't you advertise for your lost dog?

　　He can't read.

　　50. On which side does a bird have the most feathers?

　　The outside.