1-aя строка: were used; be mixed
2-aя строка: was extracted
3-ья строка: have been found; was extracted
4-aя строка: first; hammered
5-aя строка: again; shaped
6-aя строка: to make; to melt
7-aя строка: to produce; is made from
8-aя строка: harder
9-aя строка: easily