1. Among the most complex crystals are that of silicon dioxide, which has seven different structure at various temperatures and pressures, the most common being quartz.
여기서 답이 that->those 이란 것은 알겠는데 그러면 다음 구절 which has 가 틀리게 되는거 아닌가요? which 가 those 를 받게 되면 복수 have가 될거라 생각하는데..
2. Contemporary film directors, some of them wirte the scrippts for, act in , and even produce their own motion pictures, are thereby assuming ever more control of their art.
답이 them인데요.. 왜 them이 안되는 것일까요? -_-;
답변 부탁드립니다 ^^