11.What does everybody do at the same time?
12.What resembles half a pie?
13.Who works only one day in a year but never gets fired?
14.When do people have two mouth?
15.Why do lions eat raw meat?
16.How many sides does a circle have?
17.What animal can jump as high as a tree?
18.How can you be completely sleepless for seven days and still lack no rest?
19.Where was the Declaration of Independence signed?
20.If you throw a stone into the Red Sea,what will it become?
答案：
11. Grow old!
12. The other half!
13. Santa Claus 圣诞老人
14. When there's two of them 有两个人时!
15. They don't know how to cook 他们不知道如何烹饪!
16. Two. The inside and the outside!
17. All animals,for trees can't jump!
18. Sleep at night!
19. At the bottom!
20. Wet!