补全对话。用适当的单词补全对话。

W: What happened before printing was invented?

M: People had to use   l  _ ways to record information. In the beginning they used to carve Chinese

characters on stones to   2     important dates in history.

W: Do you call that printing?

M: No, not exactly. But later, people developed a    3    of printing, using rocks.

W: How?

M: After they carved the    4     on rocks, they put a piece of wet paper on top of the characters and beat

it lightly. Then they brushed ink on the paper.

W: How did the printing come out?

M: The characters on the paper were    5       , and the rest of the paper was black.