We went to Doi Tam, a village famous (25)______ its drum making techniques, in Ha Nam Province last month. The craft was first introduced to the village sometime in the 8th or 9th century. Today there are more than six hundred drum makers living in Doi Tam village. #x200eI was amazed to see big drums in front of every house in the village. People say that it (26)______ four workers three days to make a drum with a diameter of 1.5 metres. To make a drum, the craftsmen have to follow an eight-stage process. Stretching the drumhead is the most challenging stage (27)_______ they have to carefully assess the sound it makes. The other steps do not require such high skills. #x200eNowadays, Doi Tam drums are not only famous in Viet Nam but are also (28)_______ to other countries such as Laos, Cambodia, Japan, and the USA. A. so B. since C. although D. but