题目内容：

根据短文内容，回答下列问题。

No one knows who invented the pencils or when it happened. A Swiss described a pencil in a book in 1565. He said it was a piece of wood with lead (铅) inside it. Pencils weren’t popular. Then, in 1795, someone started making pencils from graphite (石墨), and they became very popular. Today, people still make pencils in the same way. They put it inside a piece of wood.

One pencil can write 50, 000 English words or make a line 55 kilometers long.

Before the pencils were widely used, people used bird feathers (羽毛) as pens. When people wrote with feather pens, they had to put the point into ink after every few letters. Next, someone invented a fountain pen(自来水笔) that could hold ink inside it. A fountain pen can write a few pages before you have to fill it again.

Two brothers, Ladislao and George Biro, invented the ballpoint pen (圆珠笔) that we all use today. They left their country Hungary (匈牙利) and started making ballpoint pens in England in 1943, during World War II. Later, a French company called Bic bought the Biro brothers’company. Some people call the ballpoint pens “Bics.”  Australians call them “biros.” Whatever we call them, we use them every day.

1.What instruments for writing are mentioned in the passage?

___________________________________________________________

2.Which was used more often before 1795, pencils or feather pens?

__________________________________________________________

3.Who invented ballpoint pens?

__________________________________________________________

4.Where were ballpoint pens made by Biro brothers?

__________________________________________________________

5.What does the underlined word “them” refer to(指代)?;

__________________________________________________________