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1. How many sides does a circle have?
2. What animal can jump as high as a tree?

3. How can you be completely sleepless for seven days and still lack no rest?

4. Why is the library the highest building? （为什么图书馆是最高的建筑物？）

5. Where was the Declaration of Independence signed?

6. If you throw a stone into the Red Sea, what will it become?

7. If two's company and three's crowd, what's four and five?

8. What is the smallest bridge in the world?

9. Who works only one day in a year but never gets fired?

10. When do people have two mouth?

11. Why do lions eat raw meat?

12. Why can a bride hide nothing? （为什么新娘子什么也藏不住？）

13. What can you tell from Peter's record card with extremely poor grades?

14. What does everybody do at the same time?

15. What resembles half a pie?

16. Why did the boy make his dog sit in the sun? （男孩为什么让他的狗坐在阳光下？）

17. How do you feel today?

18. How can you make a rope shorter without cutting or winding it?

19. Why do people wish for something they haven't got?

20. What always goes up and never goes down? （什么东西只升不降？）

21. What letter is an animal?

22. What letter is a question?

23. Why is U the jolliest letter?

24. Will liars be honest after they die? （骗子死了之后会诚实吗？）

25. Why are girls afraid of the letter C ?

26. Why is the letter E so important?

27. Why are the letter G and letter S in "gloves" close to each other?

28. What will you break once you say it? （什么东西一说出来就打破？）

29. Why are giraffes the cheapest to feed? 为什么养长颈鹿最不花钱？

30. Why are dogs afraid to sunbathe? 狗为什么害怕日光浴？

31. Why is the pig always eating? 猪为什么没完没了地吃？

32. Why are politicians no longer concerned with snowball fights? 政客们为什么不再关注打雪仗了？

33. Why don't women get bald as soon as men? 为什么总是男人比女人先秃头？

34. What can pierce one's ears without a hole? 什么东西不用打洞就可以在耳朵上穿孔？

35. What's the longest word in the world? 世界上最长的单词是什么？

36. Why does time fly? 时间为何飞逝？

37. Where can a dog get another tail? 狗去哪里可以再弄到一条尾巴？

38. What can you catch, but not throw?

39. What word starts with "E" and ends with "E" but only has one letter in it?

40. What has four fingers and a thumb, but is not alive?

41. What word looks the same written normally, upside down and backward?

42. A man is lost in a forest on a cold night. Luckily he sees a cabin in the distance. Inside, he finds a candle, an oil lamp, paper and logs in a fireplace. He only has one match. What should he light first?

43. How can you divide six potatoes among 20 people? （你怎么把六个土豆分给20个人？）

44. What has a bottom at its top?（什么东西在它的顶端有个底部？）

45. What is white when it's dirty and black when it's clean? 什么东西当它脏的时候是白色，当它干净时是黑色？

46. What kind of umbrella does a Russian carry when it's raining? 当下雨时一个俄国人带着什么样的伞？

47. What travels around the world and stays in a corner? 什么东西周游世界却呆在一个角落里？

48. What two things can't you have for breakfast? 早饭时不能吃哪两样东西？

49. Who earns a living by driving his customers away? 什么人靠驱赶顾客为生？

50. Why nobody knows how to call a deer with no eyes? 没有眼睛的小鹿叫什么？
Answer:

1. Two. The inside and the outside!

2. All animals,for trees can't jump!

3. Sleep at night!

4. It has the most stories. （它的楼层最多。Story 故事，楼层）

5. At the bottom!

6. Wet!

7. Nine!

8. The bridge of a nose. （鼻梁）

9. Santa Claus 圣诞老人

10. When there's two of them 有两个人时!

11. They don't know how to cook 他们不知道如何烹饪!

12. Because someone will give her away. （因为有人会揭发她。Give away 揭发，在婚礼上把新娘交给新郎）

13. He didn't cheat!

14. Grow old!

15. The other half!

16. He wants to have a hot dog. （他想要一条热狗。）

17. With my hands ,of course!

18. Take a longer rope and compare with it!

19. What else is there to wish for? You cease to wish for it once you get it!

20. Your age. （你的年龄）

21. It's the letter B!

22. It's the letter Y!

23. Because it's in the midst of fun!

24. No, they won't. They lie still after they die.（不会，他们依旧撒谎。Lie still 躺着不动，依旧撒谎。

25. Because it makes fat fact!

26. Because it's the begining of everything!

27. Because there is love between them!

28. Silence. （沉默）

29. They make a little food go a long way. 因为它们脖子长，一点点食物都要走很长的路才能咽下去。

30. They don't want to be hot-dog. 因为它们不想成为热狗。

31. He's making a hog of himself. 它想成为一只肉猪。

32. The cold war is over. 冷战结束了。

33. Because women wear hire longer. 因为女人头发留得长。

34. Noice. 噪音。

35. Smiles. Because there's a mile between the letter 's'. 微笑。因为两个字母S中间隔了一里。

36. To get away from all those who are trying to kill it. 为的是甩掉所有要谋杀它的人。

37. At a retail store. 在零售商店。

38. a cold

39. envelope

40. a glove

41. swims

42. He has to light the match first.

43. Boil them and mash them! 先煮熟再捣碎它们。

44. A leg 腿。（注：bottom既有“底”的意思，也有“臀部”的意思）

45. A blackboard 黑板。

46. A wet one 一把湿的伞。

47. A stamp 邮票。

48. Lunch and dinner 午饭和晚饭。

49. A taxi-driver 出租司机。（注：drive有“驾驶”的意思，也有“驱赶”的意思）

50. No idea 不知道。（注：idea发音和eye加上deer的发音相同）