（three ,friend ,discover ,write ,life ,invent ）
1 A（friendship,友谊）between gentlemen is like a cup of tea.
2.Paper-making is one of the Four Great （discoveries,发现,复数）of Ancient China.
3.A pen is used for（writing,写字,动名词）.
4.In the （third,第三）century ,a Chinese man wrote about how to make gunpowder .
5.Computers are very important to people’s daily （life,生活）.
6.This is an important（invention,发明）to human beings.