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.