急求英语脑筋急转弯《要简单的！谢

1、What word can be seen if I jump into the water?

2、What has a tongue but can't speak?

3、What has three hands but only one face?

4、From what number can you take half and leave nothing?

What letter is a animal? It is B.
什么是个动物？ 是B

问题：少了一本书
答案：缺一book

缺一book

缺一book