Question

B______of the twins are funny and they are b______students.

Answer 1

Both______of the twins are funny and they are both______students
参考： both用法
1）adj. 两者
一般单独修饰名词（复数）做前置定语（但名词前不能有其他限定词修饰），不做表语/补足语。
如：There are many flowers on both sides of the street.
2）pron. 两者
可以单独使用（相当于名词），也可以构成“both of + 其他限定词 + 名词（复数）”或“both of + 代词”结构。
Both are my good friends.
Both of the boys over there are my good friends.
Both of them are my good friends.
3）adv. 两者都
一般放在句中，即be动词之后/前均可，助动词/情态动词/行为动词之前。
They are both my classmates.
They both can play soccer well.
They both have a good son.
4）conj. 不仅...而且...；...和...都...
一般构成both...and...结构，用于连接句中任意两个并列部分。
如果并列两个主语，谓语动词一般采用复数形式。
如：Both you and I are students.
I can speak both English and Chinese.
They can both sing and dance.
The boy is so lazy that he sleeps both in the daytime and at night.

Answer 2

Both of the twins are funny and they are both students.
这两个双胞胎都很有趣，而且他们都是学生。
这个句子练习的是both的含义及其用法。
即：放在实义动词前面；be动词后面。