SORU: paragrafta boş bırakılan yere uygun düşen cümleyi bulunuz
Glass-blowing is an ancient skill which is still performed in a few towns and villages, it became a popular trade in mediaeval societies when a wider selection of tubes and funnels were developed for blowing the hot liquid glass. …………… However, much of a glass-blowers success depends on regulating his breath at the appropriate moment, rather than the implements he uses.