What's in your pencil-box?____a pen,two pencil and several rulers.

What's in your pencil-box?____a pen,two pencil and several rulers.

is.be动词的形式根据靠它近的名词的单复数形式绝定,这就是所谓的就近原则.Is 就近原则 Is

They are
有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)