帮我解答一下英语的IQ题!
1.Why is nine afraid of seven
2.What kind of ship never sinks?
3.What kind of dog would a person bite
4.What'sthe end of everything?
5.What goes up when the rain come down?
6.What has teeth but doesn't bite?
7.What is white when it is dirty?
8.What never asks questions ,but gets a lot of answers?
9.What nail should you never hit with a hammer?