What is the hardest thing about learning to ride a bicycle?
地面（The ground）hard有困难和硬的意思.
What always has one eye open but can't see?
肚脐眼(the bellybutton)
What goes all over the house,but touches nothing?
空气(Air)
What belongs only to you and yet is used more by others than by yourself?
姓名(name)
Which letter of the alphabet separates Europe from Africa?
C (Sea,非洲同欧洲之间有地中海同红海)
Why is a river rich?
because it has 2 banks!(bank的意思有岸,还有银行的意思）
I have cities but no houses,forests but no trees; rivers but without water what am
地图(map)
A man jumped from a plane,but there was nothing wrong with him.Do you know why?
跳伞（bail out）
In a train,a woman saw other peoples’ faces were dirty.What would she do,do you know?
她会闭上眼.（She would close her eyes,of course.)
Why did John say he didn’t know where the sun was?
他是盲人（He is blindman)
Where does a person stay for the longest time in his life?
地球（Earth)
Why does Tom’s mother go to work by plane every day?
她是空乘人员
What man can not live inside a house?
雪人(A snowman.)
What match can’t be put in a match box?
任何比赛都不能在火柴盒内进行.（match有火柴和比赛的意思）
What is it,which will tomorrow and was be yesterday?
今天(Today)
What has many teeth but never uses then for eating?
梳子(A comb)
The more you take away,the bigger I become.What am
孔(A hole)